Bài 1. Hình vuông - Tam giác đều - Lục giác đều

<br />Giải bài 1 trang 67 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Cho hình vuông ABCD có AB = 7cm. Tính độ dài các đoạn thẳng BC, DC, AD.</p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Dựa vào đặc điểm về cạnh của hình vuông.</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">ABCD là hình vuông nên AB = BC = DC = AD = 7cm.</p><div><br /></div><div style="line-height: 26px; margin: 0px; padding: 0px;"></div></div><ins class="982a9496" data-key="8c1a76b9ab4d8e1356920626d3ae545d" style="margin: 0px; padding: 0px;"></ins></div>Giải bài 2 trang 67 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Dùng thước và eke để vẽ hình vuông có độ dài cạnh 5cm</p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Mô tả các bước vẽ hình vuông bằng thước và êke</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="179" src="https://img.loigiaihay.com/picture/2022/1101/capture_7.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="550" /></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng thước vẽ đoạn thẳng AB = 5 cm</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng eke và thước vẽ các đường thẳng vuông góc với AB tại A và B.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Trên đường vuông góc tại A lấy điểm D với AD = 5cm. Trên đường vuông góc tại B lấy điểm C với BC = 5cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Kẻ đoạn thẳng nối C và D ta được tứ giác ABCD là hình vuông có độ dài cạnh 5cm</p></div></div>Giải bài 3 trang 67 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Hãy vẽ một hình vuông có cạnh là 8 cm rồi dùng compa so sánh hai đường chéo của hình vuông đó.</p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Bước 1: Vẽ hình vuông cạnh 8cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Bước 2: Xác định hai đường chéo và so sánh chúng bằng compa.</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng thước vẽ đoạn thẳng AB = 8 cm</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng eke và thước vẽ các đường thẳng vuông góc với AB tại A và B.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Trên đường vuông góc tại A lấy điểm D với AD = 8cm. Trên đường vuông góc tại B lấy điểm C với BC = 8cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Kẻ đoạn thẳng nối C và D ta được tứ giác ABCD là hình vuông có độ dài cạnh 8cm</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="173" src="https://img.loigiaihay.com/picture/2022/1101/capture_6.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="535" /></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Nối 2 đường chéo AC và BD. Dùng comp so sánh 2 bán kính lần lượt là AC và BD dễ dàng suy ra hai đường chéo này bằng nhau.</p></div></div>Giải bài 4 trang 67 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Cho tam giác đều MNP có NP = 3cm. Tính độ dài các cạnh MN, MP</p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Dựa vào đặc điểm về cạnh của tam giác đều.</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Tam giác MNP là tam giác đều nên MN = NP = MP = 3cm.</p><div><br /></div><div style="line-height: 26px; margin: 0px; padding: 0px;"></div></div><ins class="982a9496" data-key="8c1a76b9ab4d8e1356920626d3ae545d" style="margin: 0px; padding: 0px;"></ins></div>Giải bài 5 trang 67 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Dùng thước và compa để vẽ tam giác đều có độ dài cạnh 6cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng thước vẽ đoạn thẳng AB = 6cm</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng compa vẽ các phần đường tròn cùng bán kính 6cm và có tâm lần lượt là A, B.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Hai phần đường tròn nói trên cắt nhau tại điểm C.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Kẻ đoạn thẳng nối C và A, C và B ta có tam giác đều ABC với cạnh 6cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"> <img height="164" src="https://img.loigiaihay.com/picture/2022/1101/capture_5.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="537" /></p></div></div>Giải bài 6 trang 67 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Hãy vẽ một hình vuông có cạnh là 4cm rồi vẽ tiếp ra bên ngoài bốn tam giác đều có cạnh là cạnh hình vuông lên một tờ giấy. Dùng kéo cắt hình vừa vẽ rồi xếp theo các cạnh của hình vuông để có một bao thư.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">+) Vẽ hình vuông cạnh 4 cm</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng thước vẽ đoạn thẳng AB = 4 cm</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng eke và thước vẽ các đường thẳng vuông góc với AB tại A và B.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Trên đường vuông góc tại A lấy điểm D với AD = 4 cm. Trên đường vuông góc tại B lấy điểm C với BC = 4 cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Kẻ đoạn thẳng nối C và D ta được tứ giác ABCD là hình vuông có độ dài cạnh 4 cm</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="174" src="https://img.loigiaihay.com/picture/2022/1101/capture_3.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="527" /></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">+) Vẽ bốn tam giác đều và xếp lại thành bao thư:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="291" src="https://img.loigiaihay.com/picture/2022/1101/capture_4.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="494" /></p></div></div>Giải bài 7 trang 67 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Cho 6 hình tam giác đều (bằng giấy) cùng có độ dài cạnh 5 cm. Hãy nêu cách gấp 6 hình tam giác đó để có một lục giác đều với cạnh bằng 5 cm.</p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAGCAYAAAD68A/GAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA2ZpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuMy1jMDExIDY2LjE0NTY2MSwgMjAxMi8wMi8wNi0xNDo1NjoyNyAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wTU09Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0UmVmPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvc1R5cGUvUmVzb3VyY2VSZWYjIiB4bWxuczp4bXA9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC8iIHhtcE1NOk9yaWdpbmFsRG9jdW1lbnRJRD0ieG1wLmRpZDoxM0UzREU1OEVDMzZFODExQkQ5N0VEMEYzMTQyQzg0NSIgeG1wTU06RG9jdW1lbnRJRD0ieG1wLmRpZDo5NTFEMTQyQTM3QUExMUU4OTg2OUQ0MzRDMEZGNkVBQiIgeG1wTU06SW5zdGFuY2VJRD0ieG1wLmlpZDo5NTFEMTQyOTM3QUExMUU4OTg2OUQ0MzRDMEZGNkVBQiIgeG1wOkNyZWF0b3JUb29sPSJBZG9iZSBQaG90b3Nob3AgQ1M2IChXaW5kb3dzKSI+IDx4bXBNTTpEZXJpdmVkRnJvbSBzdFJlZjppbnN0YW5jZUlEPSJ4bXAuaWlkOjEzRTNERTU4RUMzNkU4MTFCRDk3RUQwRjMxNDJDODQ1IiBzdFJlZjpkb2N1bWVudElEPSJ4bXAuZGlkOjEzRTNERTU4RUMzNkU4MTFCRDk3RUQwRjMxNDJDODQ1Ii8+IDwvcmRmOkRlc2NyaXB0aW9uPiA8L3JkZjpSREY+IDwveDp4bXBtZXRhPiA8P3hwYWNrZXQgZW5kPSJyIj8+eFCcKwAAAHdJREFUeNpiDA0NvcXAwDAbiLsZsINSIE5lAhIbgbgLiLOxKMqGym1iARJlQCwAxJOB+AsQL4QqioeKzQWZClL4H4gzgJgbKvgVqhDEXgnE6SA1LFDBv1ATQIqXQsW2QsVAcgwsSO75DcShIPdA+WFA/AsmCRBgAO7AGQt+AUtuAAAAAElFTkSuQmCC" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Ghép 6 hình tam giác đều thành 1 hình lục giác đều bằng cách đặt các tam giác sao cho 6 tam giác có chung một đỉnh, các cạnh của chúng hoặc chung 1 đỉnh hoặc chung 1 cạnh.</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Ta ghép các tam giác sao cho 6 tam có chung 1 đỉnh, các cạnh của chúng hoặc chung 1 đỉnh hoặc chung 1 cạnh, như sau:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img src="https://img.loigiaihay.com/picture/2022/1101/capture_2.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 500px; padding: 0px; width: 500px;" /></p></div></div>Giải bài 8 trang 67 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Cho lục giác đều MNIJHK với cạnh MN = 6 cm và đường chéo NH = 12 cm. Tính độ dài các đoạn thẳng HK và IK.</p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Xác định các đoạn HK, IK rồi kết luận độ dài.</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">MNIJHK là lục giác đều nên:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">MN = HK = 6 cm (Vì MN và HK đều là cạnh của lục giác đều.)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Vì IK, NH, MJ là các đường chéo chính của lục giác đều nên:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">IK = NH = 12 cm</p></div></div>Giải bài 9 trang 67 Sách bài tập Toán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><h2 class="s14 lineheight" style="font-size: 16px; font-weight: 400; line-height: 1.7; margin: 0px 0px 0.75em; padding: 0px;"><strong style="margin: 0px; padding: 0px;">Cho lục giác đều ABCDEG a) Hãy đếm các đường chéo của lục giác vẽ từ mỗi đỉnh của lục giác. Hãy cho biết có bao nhiêu đường chéo được đếm 2 lần. b) Hãy cho biết lục giác trên có bao nhiêu đường chéo.</strong></h2></div><p> </p><p><span style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 18px; text-align: justify;">Cho lục giác đều ABCDEG</span></p><div style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 18px; line-height: 26px; margin: 10px 0px 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">a) Hãy đếm các đường chéo của lục giác vẽ từ mỗi đỉnh của lục giác. Hãy cho biết có bao nhiêu đường chéo được đếm 2 lần.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">b) Hãy cho biết lục giác trên có bao nhiêu đường chéo.</p></div><div class="box-question top20" id="sub-question-1" style="background-color: white; border-bottom: 1px dotted rgb(225, 225, 225); font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 18px; height: auto; line-height: 26px; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 20px !important; padding: 0px; text-align: justify; width: calc(100% - 40px) !important;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="color: #2888e1; font-family: OpenSansBold; margin: 0px; padding: 0px;">Câu a</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">a) Hãy đếm các đường chéo của lục giác vẽ từ mỗi đỉnh của lục giác. Hãy cho biết có bao nhiêu đường chéo được đếm 2 lần.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải:</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">a) Bước 1: Vẽ lục giác và các đường chéo từ đỉnh A.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Bước 2: Từ hình vẽ suy ra các đường chéo từ các đỉnh còn lại và đếm số đỉnh được đếm 2 lần.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết:</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">a) Từ đỉnh A có 3 đường chéo là: AC, AD, AE.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Từ đỉnh B có 3 đường chéo là: BD, BE, BG.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Từ đỉnh C có 3 đường chéo là: CE, CG, CA.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Từ đỉnh D có 3 đường chéo là: DG, DA, DB.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Từ đỉnh E có 3 đường chéo là: EA, EB, EC.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Từ đỉnh G có 3 đường chéo là: GB, GC, GD.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Trong đó 9 đường chéo được đếm 2 lần.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="293" src="https://img.loigiaihay.com/picture/2022/1031/capture_49.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="278" /></p><div style="line-height: 26px; margin: 15px 0px; padding: 0px; text-align: center;"></div></div><div class="box-question top20" id="sub-question-2" style="background-color: white; border-bottom: 1px dotted rgb(225, 225, 225); font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 18px; height: auto; line-height: 26px; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 20px !important; padding: 0px; text-align: justify; width: calc(100% - 40px) !important;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="color: #2888e1; font-family: OpenSansBold; margin: 0px; padding: 0px;">Câu b</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">b) Hãy cho biết lục giác trên có bao nhiêu đường chéo.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải:</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">b) Tính tổng đường chéo. Dựa vào số đường chéo được đếm 2 lần để suy ra số đường chéo của lục giác.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết:</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">b) Tổng số đường chéo kể cả các đường được đếm 2 lần là:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">3 . 6 = 18 (đường)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Mà mỗi đường chéo đều đước đếm 2 lần, do đó số đường chéo của lục giác là:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">18 : 2 = 9 (đường chéo)</p></div>

Bài 1. Hình vuông - Tam giác đều - Lục giác đều

Giải bài 1 trang 67 Sách bài tậpToán 6 – Chân trời sáng tạo Đề bài Cho hình vuông ABCD có AB = 7cm. Tính độ dài các đoạn thẳng BC, DC, AD. P...

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Bài 2. Hình chữ nhật - Hình thoi - Hình bình hành - Hình thang cân

<p> </p><br />Giải bài 1 trang 71 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Cho hình chữ nhật ABCD có AB = 16 cm, BC = 12 cm, BD = 20 cm. Tính độ dài của AD, DC, AC.</p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Vẽ hình chữ nhật, xác định các cặp cạnh và đường chéo của hình chữ nhật.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Hình chữ nhật có các cặp cạnh đối bằng nhau, 2 đường chéo bằng nhau.</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Ta có:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">AD = BC = 12 cm;</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">AB = DC = 16 cm;</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">AC = BD = 20 cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="196" src="https://img.loigiaihay.com/picture/2022/1031/capture_48.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="250" /></p></div></div>Giải bài 2 trang 71 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Cho hình thoi MNPQ có PQ = 10 cm. Tính độ dài của MN, NP, MQ.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Hình thoi có 4 cạnh bằng nhau, do đó: MN = NP = MQ = PQ = 10 cm.</p><div><br /></div><div style="line-height: 26px; margin: 0px; padding: 0px;"></div></div><ins class="982a9496" data-key="8c1a76b9ab4d8e1356920626d3ae545d" style="margin: 0px; padding: 0px;"></ins></div>Giải bài 3 trang 71 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Cho hình bình hành ABCD có O là giao điểm hai đường chéo và thỏa mãn AB = 8cm, AD = 5cm, OC = 3 cm. Tính độ dài của CD, BC, AC.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Do ABCD là hình bình hành</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Nên: AB = CD = 8cm; BC = AD = 5 cm (hai cặp cạnh đối diện bằng nhau)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Và: AC = 2.OC = 6 cm (hai đường chéo cắt nhau tại trung điểm của mỗi đường)</p><div><br /></div><div style="line-height: 26px; margin: 0px; padding: 0px;"></div></div><ins class="982a9496" data-key="8c1a76b9ab4d8e1356920626d3ae545d" style="margin: 0px; padding: 0px;"></ins></div>Giải bài 4 trang 71 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Cho hình thang cân EGIH với cạnh đáy là EG và IH. Biết GI = 3 cm, EI = 7cm. Hãy tính EH, GH.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="186" src="https://img.loigiaihay.com/picture/2022/1031/capture_47.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="354" /></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Ta có: EGIH là hình thang cân nên</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">EH = GI = 3cm</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">GH = EI = 7cm </p></div></div>Giải bài 5 trang 71 Sách bài tập Toán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Hãy nêu cách ghép hai tam giác đều cùng có cạnh 4 cm thành một hình thoi.</p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Ghép 2 tam giác sao cho chúng có chung một cạnh, các cạnh còn lại không trùng lên nhau.</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Ghép 2 tam giác sao cho chúng có chung một cạnh, các cạnh còn lại không trùng lên nhau.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="168" src="https://img.loigiaihay.com/picture/2022/1031/capture_44.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="262" /></p></div></div>Giải bài 6 trang 71 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Hãy nêu cách ghép hình chữ nhật có chiều dài 4 cm, chiều rộng 3 cm với hai tam giác vuông có cạnh góc vuông là 3cm và 2cm thành một hình thang cân.</p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Ghép hai tam giác vuông vào hai bên của hình chữ nhật sao cho chiều rộng của HCN trùng với cạnh 3cm của tam giác vuông.</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Ghép hai tam giác vuông vào hai bên của hình chữ nhật sao cho chiều rộng 3cm của hình chữ nhật trùng với cạnh 3cm của tam giác vuông.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="180" src="https://img.loigiaihay.com/picture/2022/1031/capture_41.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="379" /></p></div></div>Giải bài 7 trang 71 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Nêu cách vẽ hình chữ nhật ABCD với AB = 6 cm, BC = 4 cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng thước thẳng vẽ đoạn thẳng AB = 6 cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng êke và thước kẻ đường AD, BC vuông góc với AB tại A, B và BC = AD = 4cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Nối C với D ta được tứ giác ABCD là hình chữ nhật cần vẽ.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img src="https://img.loigiaihay.com/picture/2022/1017/capture.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 500px; padding: 0px; width: 500px;" /></p></div></div>Giải bài 8 trang 71 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Nêu cách vẽ hình thoi MNPQ với MN = 5 cm, đường chéo MP = 8 cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng thước thẳng vẽ đoạn thẳng MP = 8 cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng com pa vẽ đường tròn tâm M bán kính 5cm rồi vẽ đường tròn tâm P bán kính 5 cm. Hai đường tròn trên cắt nhau tại hai điểm N và Q (xem hình dưới)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Nối N với M, N với P, Q với M, Q với P ta được tứ giác MNPQ là hình thoi cần vẽ.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="217" src="https://img.loigiaihay.com/picture/2022/1031/capture_38.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="288" /></p></div></div>Giải bài 9 trang 71 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Nêu cách vẽ hình bình hành MNPQ với MN = 3 cm, NP = 5 cm, MP = 6 cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng thước thẳng vẽ đoạn thẳng MN = 3 cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Dùng compa vẽ một phần đường tròn tâm M bán kính 6 cm. Vẽ một phần đường tròn tâm N bán kính 5 cm. Hai phần đường tròn trên cắt nhau tại điểm P (xem hình dưới).</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Nối N với P. Từ M kẻ đường thẳng MQ song song với NP và MQ = 5 cm.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">- Nối P với Q ta được tứ giác MNPQ là hình bình hành cần vẽ.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="162" src="https://img.loigiaihay.com/picture/2022/1031/capture_34.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="282" /></p></div></div>

Bài 2. Hình chữ nhật - Hình thoi - Hình bình hành - Hình thang cân

  Giải bài 1 trang 71 Sách bài tậpToán 6 – Chân trời sáng tạo Đề bài Cho hình chữ nhật ABCD có AB = 16 cm, BC = 12 cm, BD = 20 cm. Tính độ d...

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Bài 3. Chu vi và diện tích của một số hình trong thực tiễn

<p> </p><br />Giải bài 1 trang 75 Sách bài tập Toán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Tính chu vi và diện tích của hình bên, biết AB = AD = 4 cm, BC = CD = 2 cm, các góc B và D đều là góc vuông.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="185" src="https://img.loigiaihay.com/picture/2022/1031/capture_28.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="248" /></p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Bước 1: Tính chu vi bằng tổng độ dài các cạnh.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Bước 2: Để tính diện tích, ta chia hình đó thành 2 tam giác vuông (ABC và ADC)</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">+) Chu vi của hình là:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">P = AB + BC + CD + DA = 4 + 2 + 2 + 4 = 12 (cm)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">+) Chia hình đã cho thành 2 hình tam giác ABC và ADC, lần lượt vuông tại B và D.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Ta có: tổng diện tích hai tam giác bằng diện tích hình đã cho.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="210" src="https://img.loigiaihay.com/picture/2022/1031/capture_30.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="255" /></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Mà diện tích tam giác ABC là:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msub><mi>S</mi><mn>1</mn></msub></mrow><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mo>.</mo><mi>A</mi><mi>B</mi><mo>.</mo><mi>B</mi><mi>C</mi><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mn>.4</mn><mn>.2</mn><mo>=</mo><mn>4</mn><mo stretchy="false">(</mo><mi>c</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow><mo stretchy="false">)</mo></math>" id="MathJax-Element-1-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-1" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-2" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-3" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-4" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-5" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px -0.032em 0px 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-6" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.461em 0.032em 0.278em 0px; white-space: pre;">S</span></span></span><span class="mjx-sub" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: -0.212em;"><span class="mjx-mn" id="MJXc-Node-7" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">1</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-8" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-mfrac MJXc-space3" id="MJXc-Node-9" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; margin: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-10" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-11" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; margin: 0px; padding: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; margin: 0px; padding: 0px; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mo" id="MJXc-Node-12" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: -0.181em 0px 0px; padding: 0px 0px 0.324em; white-space: pre;">.</span></span><span class="mjx-mi MJXc-space1" id="MJXc-Node-13" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.167em; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.507em 0px 0.278em; white-space: pre;">A</span></span><span class="mjx-mi" id="MJXc-Node-14" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.461em 0px 0.278em; white-space: pre;">B</span></span><span class="mjx-mo" id="MJXc-Node-15" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: -0.181em 0px 0px; padding: 0px 0px 0.324em; white-space: pre;">.</span></span><span class="mjx-mi MJXc-space1" id="MJXc-Node-16" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.167em; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.461em 0px 0.278em; white-space: pre;">B</span></span><span class="mjx-mi" id="MJXc-Node-17" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.461em 0.045em 0.278em 0px; white-space: pre;">C</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-18" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-mfrac MJXc-space3" id="MJXc-Node-19" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; margin: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-20" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-21" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; margin: 0px; padding: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; margin: 0px; padding: 0px; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mn" id="MJXc-Node-22" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">.4</span></span><span class="mjx-mn" id="MJXc-Node-23" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">.2</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-24" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-25" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">4</span></span><span class="mjx-mo" id="MJXc-Node-26" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">(</span></span><span class="mjx-mi" id="MJXc-Node-27" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">c</span></span><span class="mjx-texatom" id="MJXc-Node-28" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-29" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-30" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-31" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-32" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span><span class="mjx-mo" id="MJXc-Node-33" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">)</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msub><mi>�</mi><mn>1</mn></msub></mrow><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mo>.</mo><mi>�</mi><mi>�</mi><mo>.</mo><mi>�</mi><mi>�</mi><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mn>.4</mn><mn>.2</mn><mo>=</mo><mn>4</mn><mo stretchy="false">(</mo><mi>�</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow><mo stretchy="false">)</mo></math></span></span></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Và diện tích tam giác ADC là: <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msub><mi>S</mi><mn>2</mn></msub></mrow><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mo>.</mo><mi>A</mi><mi>D</mi><mo>.</mo><mi>D</mi><mi>C</mi><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mn>.4</mn><mn>.2</mn><mo>=</mo><mn>4</mn><mo stretchy="false">(</mo><mi>c</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow><mo stretchy="false">)</mo></math>" id="MathJax-Element-2-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-34" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-35" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-36" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-37" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-38" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px -0.032em 0px 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-39" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.461em 0.032em 0.278em 0px; white-space: pre;">S</span></span></span><span class="mjx-sub" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: -0.212em;"><span class="mjx-mn" id="MJXc-Node-40" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-41" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-mfrac MJXc-space3" id="MJXc-Node-42" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; margin: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-43" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-44" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; margin: 0px; padding: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; margin: 0px; padding: 0px; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mo" id="MJXc-Node-45" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: -0.181em 0px 0px; padding: 0px 0px 0.324em; white-space: pre;">.</span></span><span class="mjx-mi MJXc-space1" id="MJXc-Node-46" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.167em; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.507em 0px 0.278em; white-space: pre;">A</span></span><span class="mjx-mi" id="MJXc-Node-47" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.461em 0px 0.278em; white-space: pre;">D</span></span><span class="mjx-mo" id="MJXc-Node-48" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: -0.181em 0px 0px; padding: 0px 0px 0.324em; white-space: pre;">.</span></span><span class="mjx-mi MJXc-space1" id="MJXc-Node-49" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.167em; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.461em 0px 0.278em; white-space: pre;">D</span></span><span class="mjx-mi" id="MJXc-Node-50" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.461em 0.045em 0.278em 0px; white-space: pre;">C</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-51" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-mfrac MJXc-space3" id="MJXc-Node-52" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; margin: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-53" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-54" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; margin: 0px; padding: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; margin: 0px; padding: 0px; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mn" id="MJXc-Node-55" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">.4</span></span><span class="mjx-mn" id="MJXc-Node-56" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">.2</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-57" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-58" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">4</span></span><span class="mjx-mo" id="MJXc-Node-59" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">(</span></span><span class="mjx-mi" id="MJXc-Node-60" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">c</span></span><span class="mjx-texatom" id="MJXc-Node-61" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-62" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-63" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-64" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-65" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span><span class="mjx-mo" id="MJXc-Node-66" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">)</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msub><mi>�</mi><mn>2</mn></msub></mrow><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mo>.</mo><mi>�</mi><mi>�</mi><mo>.</mo><mi>�</mi><mi>�</mi><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mn>.4</mn><mn>.2</mn><mo>=</mo><mn>4</mn><mo stretchy="false">(</mo><mi>�</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow><mo stretchy="false">)</mo></math></span></span></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Do đó diện tích hình đã cho là: <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>S</mi><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><msub><mi>S</mi><mn>1</mn></msub></mrow><mo>+</mo><mrow class="MJX-TeXAtom-ORD"><msub><mi>S</mi><mn>2</mn></msub></mrow><mo>=</mo><mn>4</mn><mo>+</mo><mn>4</mn><mo>=</mo><mn>8</mn><mo stretchy="false">(</mo><mi>c</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow><mo stretchy="false">)</mo></math>" id="MathJax-Element-3-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-67" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-68" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-69" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.461em 0.032em 0.278em 0px; white-space: pre;">S</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-70" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-texatom MJXc-space3" id="MJXc-Node-71" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-72" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-73" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px -0.032em 0px 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-74" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.461em 0.032em 0.278em 0px; white-space: pre;">S</span></span></span><span class="mjx-sub" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: -0.212em;"><span class="mjx-mn" id="MJXc-Node-75" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">1</span></span></span></span></span></span><span class="mjx-mo MJXc-space2" id="MJXc-Node-76" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.222em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.278em 0px 0.416em; white-space: pre;">+</span></span><span class="mjx-texatom MJXc-space2" id="MJXc-Node-77" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.222em; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-78" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-79" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px -0.032em 0px 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-80" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.461em 0.032em 0.278em 0px; white-space: pre;">S</span></span></span><span class="mjx-sub" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: -0.212em;"><span class="mjx-mn" id="MJXc-Node-81" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-82" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-83" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">4</span></span><span class="mjx-mo MJXc-space2" id="MJXc-Node-84" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.222em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.278em 0px 0.416em; white-space: pre;">+</span></span><span class="mjx-mn MJXc-space2" id="MJXc-Node-85" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.222em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">4</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-86" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-87" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px; white-space: pre;">8</span></span><span class="mjx-mo" id="MJXc-Node-88" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">(</span></span><span class="mjx-mi" id="MJXc-Node-89" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">c</span></span><span class="mjx-texatom" id="MJXc-Node-90" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-91" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-92" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-93" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-94" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span><span class="mjx-mo" id="MJXc-Node-95" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">)</span></span></span></span></span></p></div></div><br />Giải bài 2 trang 75 Sách bài tập Toán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Tính chu vi và diện tích của hình bên, biết AB = 7 cm, BC = 2 cm, CD = 3 cm và DE = 3 cm.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="196" src="https://img.loigiaihay.com/picture/2022/0817/annotation-2022-08-17-105000.png" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="264" /></p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Tính đoạn AG, GE để suy ra chu vi.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Chia hình đã cho thành 2 hình chữ nhật để tính diện tích.</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Ta chia hình đã cho thành hai hình chữ nhật như hình dưới đây:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="240" src="https://img.loigiaihay.com/picture/2022/1031/capture_27.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="318" /></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Dễ thấy: AG = BC + DE = 2 + 3 = 5 (cm)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">GE = AF = AB – FB = AB – DC = 7 – 3 = 4 (cm)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Vậy chu vi hình trên là:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">P = AB + BC + CD + DE + EG + GA = 7 + 2 + 3 + 4 + 5 = 21 (cm)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Diện tích hình chữ nhật AFEG là: AG . GE = 5 . 4 = 20 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-1-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-1" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-2" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-3" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">c</span></span><span class="mjx-texatom" id="MJXc-Node-4" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-5" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-6" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-7" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-8" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>�</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Diện tích hình chữ nhật FBND là: BC . CD = 2 . 3 = 6 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-2-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-9" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-10" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-11" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">c</span></span><span class="mjx-texatom" id="MJXc-Node-12" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-13" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-14" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-15" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-16" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>�</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Vậy diện tích của hình đã cho là: 20 + 6 = 26 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-3-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-17" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-18" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-19" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">c</span></span><span class="mjx-texatom" id="MJXc-Node-20" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-21" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-22" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-23" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-24" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>�</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p></div></div>Giải bài 3 trang 75 Sách bài tập Toán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Tính chu vi của hình bên, biết BCDE là hình chữ nhật có diễn tích 135<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-1-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-1" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-2" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-3" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-4" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-5" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-6" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-7" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>, BC = 15 m, ABGK là hình chữ nhật có diện tích 180 <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-2-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-8" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-9" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-10" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-11" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-12" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-13" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-14" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>, BE = EG.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="233" src="https://img.loigiaihay.com/picture/2022/1031/capture_26.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="278" /></p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Bước 1: Tính BE dựa vào diện tích BCDE và cạnh BC đã biết</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Bước 2: Tính các cạnh còn lại</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Bước 3: Tính chu vi</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Ta có: diện tích hình chữ nhật BCDE là BC. BE = 135 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-3-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-15" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-16" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-17" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-18" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-19" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-20" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-21" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>), mà BC = 15 m.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">&#x21D2;</mo></math>" id="MathJax-Element-4-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-22" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-23" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mo" id="MJXc-Node-24" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.232em 0px 0.37em; white-space: pre;">⇒</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">⇒</mo></math></span></span>BE = 135 : 15 = 9 (m)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Lại có:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"> EG = BE; AK = BG = 2BE </p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"> <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">&#x21D2;</mo></math>" id="MathJax-Element-5-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-25" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-26" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mo" id="MJXc-Node-27" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.232em 0px 0.37em; white-space: pre;">⇒</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">⇒</mo></math></span></span> EG = 9m; AK = 18m </p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Mà diện tích hình chữ nhật ABGK là AB. AK = 180 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-6-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-28" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-29" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-30" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-31" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-32" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-33" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-34" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">&#x21D2;</mo></math>" id="MathJax-Element-7-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-35" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-36" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mo" id="MJXc-Node-37" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.232em 0px 0.37em; white-space: pre;">⇒</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">⇒</mo></math></span></span> AB = 180 : 18 = 10 (m)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Vậy chu vi của hình đã cho là:</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">P = AK + AB + BC + CD + DE + EG + KG = 18 + 10 + 15 + 9 + 15 + 9 + 10 = 86 (m)</p></div></div>Giải bài 4 trang 75 Sách bài tập Toán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Một mảnh vườn hình chữ nhật có chiều dài 40 m, chiều rộng 30 m với lỗi đi hình bình hành rộng 2 m (xem hình bên). Tính diện tích phần mảnh vườn không tính lối đi.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="160" src="https://img.loigiaihay.com/picture/2022/1031/capture_24.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="232" /></p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Diện tích cả hình chữ nhật trừ đi phần diện tích lỗi đi hình bình hành.</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Diện tích mảnh vườn hình chữ nhật là: 40.30 = 1200(<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-1-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-1" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-2" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-3" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-4" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-5" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-6" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-7" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Diện tích lối đi hình bình hành là: 2.30 = 60 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-2-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-8" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-9" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-10" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-11" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-12" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-13" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-14" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Vậy diện tích mảnh vườn không tính lối đi là: 1200 – 60 = 1140 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-3-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-15" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-16" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-17" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-18" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-19" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-20" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-21" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p></div></div><br />Giải bài 5 trang 76 Sách bài tập Toán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><h2 class="s14 lineheight" style="font-size: 16px; font-weight: 400; line-height: 1.7; margin: 0px 0px 0.75em; padding: 0px;"><strong style="margin: 0px; padding: 0px;">Khu vực đậu xe oto của một cửa hàng có dạng hình chữ nhật với chiều dài 14m, chiều rộng 10 m. Trong đó, một nửa khu vực dành cho quay đầu xe, hai góc tam giác để trồng hoa và phần còn lại chia đều cho bốn chỗ đậu oto a) Tính diện tích chỗ đậu xe dành cho một oto. b) Tính diện tích dành cho đậu xe và quay đầu xe.</strong></h2></div><div style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 18px; line-height: 26px; margin: 10px 0px 0px; padding: 0px; text-align: justify;"><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Khu vực đậu xe oto của một cửa hàng có dạng hình chữ nhật với chiều dài 14m, chiều rộng 10 m. Trong đó, một nửa khu vực dành cho quay đầu xe, hai góc tam giác để trồng hoa và phần còn lại chia đều cho bốn chỗ đậu oto</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">a) Tính diện tích chỗ đậu xe dành cho một oto.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">b) Tính diện tích dành cho đậu xe và quay đầu xe.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="296" src="https://img.loigiaihay.com/picture/2022/1031/capture_23.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="238" /></p></div><div class="box-question top20" id="sub-question-1" style="background-color: white; border-bottom: 1px dotted rgb(225, 225, 225); font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 18px; height: auto; line-height: 26px; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 20px !important; padding: 0px; text-align: justify; width: calc(100% - 40px) !important;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="color: #2888e1; font-family: OpenSansBold; margin: 0px; padding: 0px;">Câu a</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">a) Tính diện tích chỗ đậu xe dành cho một oto.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải:</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">a) Tính diện tích một hình bình hành (tương ứng với chỗ đậu xe dành cho một oto)</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết:</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Chiều cao của mỗi hình bình hành hay một nửa chiều rộng của hình chữ nhật là:</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">10 : 5 = 2 (m)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Diện tích mỗi hình bình hành là: 3 . 5 = 15 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-1-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-1" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-2" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-3" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-4" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-5" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-6" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-7" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Vậy diện tích mỗi chỗ đậu xe là 15<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-2-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-8" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-9" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-10" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-11" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-12" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-13" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-14" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span></p><div style="line-height: 26px; margin: 15px 0px; padding: 0px; text-align: center;"></div></div><div class="box-question top20" id="sub-question-2" style="background-color: white; border-bottom: 1px dotted rgb(225, 225, 225); font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 18px; height: auto; line-height: 26px; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 20px !important; padding: 0px; text-align: justify; width: calc(100% - 40px) !important;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="color: #2888e1; font-family: OpenSansBold; margin: 0px; padding: 0px;">Câu b</strong></p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">b) Tính diện tích dành cho đậu xe và quay đầu xe.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải:</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Cách 1: Tổng diện tích trừ đi diện tích 2 góc tam giác để trồng hoa.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Cách 2: Tổng diện tích phần đậu xe và quay xe.</p><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết:</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">b) Cách 1:</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"> Mỗi góc tam giác để trồng cây có độ dài 2 cạnh góc vuông là 5m và 14 – 3. 4 = 2(m)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">&#x21D2;</mo></math>" id="MathJax-Element-3-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-15" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-16" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mo" id="MJXc-Node-17" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.232em 0px 0.37em; white-space: pre;">⇒</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">⇒</mo></math></span></span>Tổng diện tích trồng hoa là: <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2.</mn><mfrac><mn>1</mn><mn>2</mn></mfrac><mn>.2</mn><mn>.5</mn><mo>=</mo><mn>10</mn><mspace width="thickmathspace" /><mo stretchy="false">(</mo><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow><mo stretchy="false">)</mo></math>" id="MathJax-Element-4-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-18" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-19" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mn" id="MJXc-Node-20" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2.</span></span><span class="mjx-mfrac" id="MJXc-Node-21" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; margin: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-22" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-23" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; margin: 0px; padding: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; margin: 0px; padding: 0px; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mn" id="MJXc-Node-24" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">.2</span></span><span class="mjx-mn" id="MJXc-Node-25" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px; white-space: pre;">.5</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-26" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-27" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px; white-space: pre;">10</span></span><span class="mjx-mspace" id="MJXc-Node-28" style="box-sizing: content-box !important; display: inline-block; height: 0px; margin: 0px; padding: 0px; width: 0.278em;"></span><span class="mjx-mo" id="MJXc-Node-29" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">(</span></span><span class="mjx-texatom" id="MJXc-Node-30" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-31" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-32" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-33" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-34" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span><span class="mjx-mo" id="MJXc-Node-35" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">)</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2.</mn><mfrac><mn>1</mn><mn>2</mn></mfrac><mn>.2</mn><mn>.5</mn><mo>=</mo><mn>10</mn><mspace width="thickmathspace"></mspace><mo stretchy="false">(</mo><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow><mo stretchy="false">)</mo></math></span></span></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Diện tích khu vực đậu xe hình chữ nhật là: 10 . 14 = 140 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-5-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-36" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-37" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-38" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-39" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-40" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-41" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-42" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Vậy diện tích dành cho đậu xe và quay đầu xe là: 140 – 10 =  130 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-6-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-43" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-44" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-45" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-46" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-47" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-48" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-49" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Cách 2:</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Diện tích dành cho đậu xe là: 4 . 15 = 60 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-7-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-50" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-51" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-52" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-53" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-54" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-55" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-56" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Diện tích quay đầu xe là hình chữ nhật với chiều dài 14m và chiều rộng 5m là:</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">14 . 5 = 70 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-8-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-57" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-58" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-59" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-60" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-61" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-62" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-63" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Vậy tổng diện tích dành cho đậu xe và quay đầu xe là: 60 + 70 = 130 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-9-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-64" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-65" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-texatom" id="MJXc-Node-66" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-67" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-68" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-69" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-70" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p></div>Giải bài 6 trang 76 Sách bài tậpToán 6 – Chân trời sáng tạo<div class="detail_new" style="background-color: white; font-family: OpenSans, Tahoma, Helvetica, sans-serif; font-size: 16px; line-height: 26px; margin: 0px; padding: 0px 5px; word-break: break-word;"><div class="center bottom10" style="margin-bottom: 10px !important; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding: 0px; text-align: center;"><ins class="982a9496" data-key="032300ccaf074f044010600ff650587e" style="margin: 0px; padding: 0px;"></ins></div><div class="post-toc" id="post-toc-container" style="margin: 0px; padding: 0px;"></div><div id="box-content" style="font-size: 18px; line-height: 26px; margin: 0px; padding: 0px; text-align: justify;"><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_question" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Đề bài</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Tính diện tích của hình bên, biết AB = 6cm, Ob = 3 cm, OG = 4cm, CD = 12 cm, ABCD là hình thang, BCEG là hình thoi, ba điểm A, B, E thẳng hàng.</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><img height="211" src="https://img.loigiaihay.com/picture/2022/1031/capture_20.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" width="324" /></p><div class="content_method_container" style="line-height: 26px; margin: 0px; padding: 10px 0px 2px;"><p class="content_method_header" style="background: rgb(252, 241, 196); border-radius: 5px; cursor: pointer; line-height: 26px; margin: 0px; padding: 10px; text-align: center; word-break: normal;"><strong class="content_method" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Phương pháp giải - Xem chi tiết</strong><img class="method-open-icon" id="method_colapse_icon" src="data:image/png;base64,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" style="float: right; height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px; position: relative; top: 10px;" /></p><div class="content_method_content" style="border-bottom: 1px dashed rgb(234, 214, 126); border-image: initial; border-left: 1px dashed rgb(234, 214, 126); border-right: 1px dashed rgb(234, 214, 126); border-top: none; line-height: 26px; margin: 0px 0px 10px; padding: 10px 10px 5px;"><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Tính diện tích hình thang và hình thoi từ đó suy ra diện tích cả hình.</p></div></div><p style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><strong class="content_detail" style="font-family: OpenSansBold; margin: 0px; padding: 0px;">Lời giải chi tiết</strong></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Xét hình thoi BCEG ta có:</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">BE = 2 BO = 2.3 = 6 (cm)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">CG = 2. OG = 2.4 = 8 (cm)</p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;"><span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">&#x21D2;</mo></math>" id="MathJax-Element-1-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-1" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-2" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mo" id="MJXc-Node-3" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.232em 0px 0.37em; white-space: pre;">⇒</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo stretchy="false">⇒</mo></math></span></span>Diện tích hình thoi BCEG là: <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>2</mn></mfrac><mn>.6</mn><mn>.8</mn><mo>=</mo><mn>24</mn><mspace width="thickmathspace" /><mo stretchy="false">(</mo><mi>c</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow><mo stretchy="false">)</mo></math>" id="MathJax-Element-2-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-4" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-5" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mfrac" id="MJXc-Node-6" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; margin: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-7" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-8" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; margin: 0px; padding: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; margin: 0px; padding: 0px; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mn" id="MJXc-Node-9" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px; white-space: pre;">.6</span></span><span class="mjx-mn" id="MJXc-Node-10" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px; white-space: pre;">.8</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-11" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-12" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">24</span></span><span class="mjx-mspace" id="MJXc-Node-13" style="box-sizing: content-box !important; display: inline-block; height: 0px; margin: 0px; padding: 0px; width: 0.278em;"></span><span class="mjx-mo" id="MJXc-Node-14" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">(</span></span><span class="mjx-mi" id="MJXc-Node-15" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">c</span></span><span class="mjx-texatom" id="MJXc-Node-16" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-17" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-18" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-19" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-20" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span><span class="mjx-mo" id="MJXc-Node-21" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">)</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>2</mn></mfrac><mn>.6</mn><mn>.8</mn><mo>=</mo><mn>24</mn><mspace width="thickmathspace"></mspace><mo stretchy="false">(</mo><mi>�</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow><mo stretchy="false">)</mo></math></span></span></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Diện tích hình thang ABCD là: <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>2</mn></mfrac><mo>.</mo><mo stretchy="false">(</mo><mn>6</mn><mo>+</mo><mn>12</mn><mo stretchy="false">)</mo><mn>.4</mn><mo>=</mo><mn>36</mn><mspace width="thickmathspace" /><mo stretchy="false">(</mo><mi>c</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow><mo stretchy="false">)</mo></math>" id="MathJax-Element-3-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-22" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-23" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mfrac" id="MJXc-Node-24" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; margin: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-25" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; margin: 0px; padding: 0px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-26" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; margin: 0px; padding: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; margin: 0px; padding: 0px; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mo" id="MJXc-Node-27" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: -0.181em 0px 0px; padding: 0px 0px 0.324em; white-space: pre;">.</span></span><span class="mjx-mo MJXc-space1" id="MJXc-Node-28" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.167em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">(</span></span><span class="mjx-mn" id="MJXc-Node-29" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px; white-space: pre;">6</span></span><span class="mjx-mo MJXc-space2" id="MJXc-Node-30" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.222em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.278em 0px 0.416em; white-space: pre;">+</span></span><span class="mjx-mn MJXc-space2" id="MJXc-Node-31" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.222em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">12</span></span><span class="mjx-mo" id="MJXc-Node-32" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">)</span></span><span class="mjx-mn" id="MJXc-Node-33" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">.4</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-34" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.094em 0px 0.324em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-35" style="box-sizing: content-box !important; display: inline-block; margin: 0px 0px 0px 0.278em; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px; white-space: pre;">36</span></span><span class="mjx-mspace" id="MJXc-Node-36" style="box-sizing: content-box !important; display: inline-block; height: 0px; margin: 0px; padding: 0px; width: 0.278em;"></span><span class="mjx-mo" id="MJXc-Node-37" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">(</span></span><span class="mjx-mi" id="MJXc-Node-38" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">c</span></span><span class="mjx-texatom" id="MJXc-Node-39" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-40" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-41" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-42" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-43" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span><span class="mjx-mo" id="MJXc-Node-44" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.461em 0px 0.599em; white-space: pre;">)</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>2</mn></mfrac><mo>.</mo><mo stretchy="false">(</mo><mn>6</mn><mo>+</mo><mn>12</mn><mo stretchy="false">)</mo><mn>.4</mn><mo>=</mo><mn>36</mn><mspace width="thickmathspace"></mspace><mo stretchy="false">(</mo><mi>�</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow><mo stretchy="false">)</mo></math></span></span></p><p align="left" style="line-height: 26px; margin: 0px 0px 12px; padding: 0px; word-break: normal;">Vậy diện tích cần tìm là: 24 + 36 = 60 (<span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>m</mi><mn>2</mn></msup></mrow></math>" id="MathJax-Element-4-Frame" role="presentation" style="border: 0px; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-45" style="border-collapse: separate; border-spacing: 0px; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-46" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-47" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">c</span></span><span class="mjx-texatom" id="MJXc-Node-48" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mrow" id="MJXc-Node-49" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-msubsup" id="MJXc-Node-50" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-base" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-mi" id="MJXc-Node-51" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; margin: 0px; padding: 0.232em 0px 0.278em; white-space: pre;">m</span></span></span><span class="mjx-sup" style="box-sizing: content-box !important; display: inline-block; font-size: 15.3985px; margin: 0px; padding: 0px 0.071em 0px 0px; vertical-align: 0.513em;"><span class="mjx-mn" id="MJXc-Node-52" style="box-sizing: content-box !important; display: inline-block; margin: 0px; padding: 0px;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; margin: 0px; padding: 0.37em 0px 0.324em; white-space: pre;">2</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; margin: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>�</mi><mrow class="MJX-TeXAtom-ORD"><msup><mi>�</mi><mn>2</mn></msup></mrow></math></span></span>)</p></div></div>

Bài 3. Chu vi và diện tích của một số hình trong thực tiễn

  Giải bài 1 trang 75 Sách bài tập Toán 6 – Chân trời sáng tạo Đề bài Tính chu vi và diện tích của hình bên, biết AB = AD = 4 cm, BC = CD = ...

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