TRẦN NGỌC KHÁNH NHƯ: LT Toán 5

Hiển thị các bài đăng có nhãn LT Toán 5. Hiển thị tất cả bài đăng

V. 12. Lý thuyết phép chia

a) Trong phép chia hết<img alt="" src="https://img.loigiaihay.com/picture/2019/0312/on-tap-phep-chia-1.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 300px; padding: 0px; width: 300px;" />Chú ý:   Không có phép chia cho số 0.             <mi>a</mi><mo>:</mo><mn>1</mn><mo>=</mo><mi>a</mi></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 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;">a:1<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 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;">a<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><mo>:</mo><mn>1</mn><mo>=</mo><mi>�</mi></math>             <mi>a</mi><mo>:</mo><mi>a</mi><mo>=</mo><mn>1</mn></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 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;">a:<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;">a<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;">=1<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><mo>:</mo><mi>�</mi><mo>=</mo><mn>1</mn></math> (<mi>a</mi></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 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;">a<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></math> khác <mn>0</mn></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">0<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>0</mn></math>)             <mn>0</mn><mo>:</mo><mi>b</mi><mo>=</mo><mn>0</mn></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">0:<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 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;">=0<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>0</mn><mo>:</mo><mi>�</mi><mo>=</mo><mn>0</mn></math> (<mi>b</mi></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 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 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></math> khác <mn>0</mn></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">0<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>0</mn></math>)b) Trong phép chia có dư<img alt="" src="https://img.loigiaihay.com/picture/2019/0312/on-tap-phep-chia-2.PNG" style="height: auto; margin: 0px; max-height: 100%; max-width: 431px; padding: 0px; width: 431px;" />Chú ý:     Số dư phải bé hơn số chia.

V. 12. Lý thuyết phép chia

a) Trong phép chia hết Chú ý: Không có phép chia cho số 0. a : 1 = a � : 1 = � a : a = 1 � : � = 1 ( a � ...

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V. 11. Ôn tập về Phép nhân

Phép nhân các số tự nhiên, phân số, số thập phân đều có các tính chất sau:Tính chất giao hoán:                             <mi>a</mi><mo>&#x00D7;</mo><mi>b</mi><mo>=</mo><mi>b</mi><mo>&#x00D7;</mo><mi>a</mi></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 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;">a<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: 0.186em 0px 0.324em; white-space: pre;">×<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 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 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 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: 0.186em 0px 0.324em; white-space: pre;">×<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;">a<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><mo>×</mo><mi>�</mi><mo>=</mo><mi>�</mi><mo>×</mo><mi>�</mi></math>Tính chất kết hợp:                                 <mo stretchy="false">(</mo><mi>a</mi><mo>&#x00D7;</mo><mi>b</mi><mo stretchy="false">)</mo><mo>&#x00D7;</mo><mi>c</mi><mo>=</mo><mi>a</mi><mo>&#x00D7;</mo><mo stretchy="false">(</mo><mi>b</mi><mo>&#x00D7;</mo><mi>c</mi><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 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 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;">a<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: 0.186em 0px 0.324em; white-space: pre;">×<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 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 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: 0.186em 0px 0.324em; white-space: pre;">×<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 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 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;">a<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: 0.186em 0px 0.324em; white-space: pre;">×<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 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 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: 0.186em 0px 0.324em; white-space: pre;">×<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 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 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><mi>�</mi><mo>×</mo><mi>�</mi><mo stretchy="false">)</mo><mo>×</mo><mi>�</mi><mo>=</mo><mi>�</mi><mo>×</mo><mo stretchy="false">(</mo><mi>�</mi><mo>×</mo><mi>�</mi><mo stretchy="false">)</mo></math>Nhân một tổng với một số:                     <mo stretchy="false">(</mo><mi>a</mi><mo>+</mo><mi>b</mi><mo stretchy="false">)</mo><mo>&#x00D7;</mo><mi>c</mi><mo>=</mo><mi>a</mi><mo>&#x00D7;</mo><mi>c</mi><mo>+</mo><mi>b</mi><mo>&#x00D7;</mo><mi>c</mi></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 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 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;">a<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 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 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 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: 0.186em 0px 0.324em; white-space: pre;">×<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 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 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;">a<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: 0.186em 0px 0.324em; white-space: pre;">×<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 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 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 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: 0.186em 0px 0.324em; white-space: pre;">×<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 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><mi>�</mi><mo>+</mo><mi>�</mi><mo stretchy="false">)</mo><mo>×</mo><mi>�</mi><mo>=</mo><mi>�</mi><mo>×</mo><mi>�</mi><mo>+</mo><mi>�</mi><mo>×</mo><mi>�</mi></math>Phép nhân có thừa số bằng <mn>1</mn></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">1<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>1</mn></math>:                 <mn>1</mn><mo>&#x00D7;</mo><mi>a</mi><mo>=</mo><mi>a</mi><mo>&#x00D7;</mo><mn>1</mn><mo>=</mo><mi>a</mi></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">1<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: 0.186em 0px 0.324em; white-space: pre;">×<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;">a<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 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;">a<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: 0.186em 0px 0.324em; white-space: pre;">×1<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 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;">a<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>1</mn><mo>×</mo><mi>�</mi><mo>=</mo><mi>�</mi><mo>×</mo><mn>1</mn><mo>=</mo><mi>�</mi></math>Phép nhân có thừa số bằng 0:                 <mn>0</mn><mo>&#x00D7;</mo><mi>a</mi><mo>=</mo><mi>a</mi><mo>&#x00D7;</mo><mn>0</mn><mo>=</mo><mn>0</mn></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">0<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: 0.186em 0px 0.324em; white-space: pre;">×<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;">a<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 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;">a<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: 0.186em 0px 0.324em; white-space: pre;">×0<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;">=0<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>0</mn><mo>×</mo><mi>�</mi><mo>=</mo><mi>�</mi><mo>×</mo><mn>0</mn><mo>=</mo><mn>0</mn></math>.<div> </div>

V. 11. Ôn tập về Phép nhân

Phép nhân các số tự nhiên, phân số, số thập phân đều có các tính chất sau: Tính chất giao hoán: a × b = b × ...

+ Đọc thêm »

V. 10. Ôn tập về Phép trừ

Bài 1<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;"><div style="clear: both; line-height: 26px; margin: 0px 0px 10px; padding: 0px;">Video hướng dẫn giải<div class="video-container" style="height: 0px; line-height: 26px; margin: 0px; overflow: hidden; padding: 0px 0px 326.813px; position: relative;"><iframe allowfullscreen="" data-gtm-yt-inspected-108423454_5="true" data-gtm-yt-inspected-108423454_9="true" data-gtm-yt-inspected-10="true" data-gtm-yt-inspected-16="true" frameborder="0" height="349" id="335944736" src="https://www.youtube.com/embed/X0Jx8YL7VrQ?start=0&autoplay=0&rel=0&enablejsapi=1&origin=https%3A%2F%2Floigiaihay.com" style="display: block; height: 326.813px; left: 0px; margin: 0px auto; padding: 0px; position: absolute; top: 0px; width: 581px;" title="Giải bài: Phép trừ trang 159, 160 - SGK Toán 5" width="560"></iframe></div></div>Tính rồi thử lại (theo mẫu): a) Mẫu:     <mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>&#x2212;</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>5746</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>1962</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mn>3784</mn></mrow></mtd></mtr></mtable></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 class="mjx-mtd" id="MJXc-Node-5" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.111em;"><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;">−574619623784<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>−</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>5746</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>1962</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mn>3784</mn></mrow></mtd></mtr></mtable></math>              Thử lại:       <mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>3784</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>1962</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thickmathspace" /><mn>5746</mn></mrow></mtd></mtr></mtable></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 class="mjx-mtd" id="MJXc-Node-38" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.111em;"><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;">+378419625746<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>3784</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>1962</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thickmathspace"></mspace><mn>5746</mn></mrow></mtd></mtr></mtable></math>   <mn>8923</mn><mo>&#x2212;</mo><mn>4157</mn></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">8923<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;">−4157<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>8923</mn><mo>−</mo><mn>4157</mn></math> ;                              <mn>27069</mn><mo>&#x2212;</mo><mn>9537</mn></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">27069<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;">−9537<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>27069</mn><mo>−</mo><mn>9537</mn></math> b) Mẫu:       <mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>8</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle><mo>&#x2212;</mo><mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>3</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle><mo>=</mo><mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>5</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle></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">811<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;">−311<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;">=511<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"><mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>8</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle><mo>−</mo><mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>3</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle><mo>=</mo><mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>5</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle></math>                    Thử lại:       <mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>5</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle><mo>+</mo><mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>3</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle><mo>=</mo><mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>8</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle></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">511<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;">+311<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;">=811<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"><mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>5</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle><mo>+</mo><mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>3</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle><mo>=</mo><mstyle displaystyle="true" scriptlevel="0"><mfrac><mn>8</mn><mrow class="MJX-TeXAtom-ORD"><mn>11</mn></mrow></mfrac></mstyle></math><mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>8</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow><mo>&#x2212;</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow></mstyle></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">815<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;">−215<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"><mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>8</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow><mo>−</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow></mstyle></math> ;          <mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>&#x2212;</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>1</mn><mn>6</mn></mfrac></mrow></mstyle></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; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0">712<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;">−16<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"><mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>−</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>1</mn><mn>6</mn></mfrac></mrow></mstyle></math>;          <mstyle displaystyle="true" scriptlevel="0"><mn>1</mn><mo>&#x2212;</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>3</mn><mn>7</mn></mfrac></mrow></mstyle></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; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0">1<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;">−37<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"><mstyle displaystyle="true" scriptlevel="0"><mn>1</mn><mo>−</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>3</mn><mn>7</mn></mfrac></mrow></mstyle></math>    c) Mẫu:       <mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>&#x2212;</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>7</mn><mo>,</mo><mn>254</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>2</mn><mo>,</mo><mn>678</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mn>4</mn><mo>,</mo><mn>576</mn></mrow></mtd></mtr></mtable></math>" id="MathJax-Element-10-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 class="mjx-mtd" id="MJXc-Node-177" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.556em;"><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;">−7<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 0.553em; white-space: pre;">,2542<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 0.553em; white-space: pre;">,6784<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 0.553em; white-space: pre;">,576<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>−</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>7</mn><mo>,</mo><mn>254</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>2</mn><mo>,</mo><mn>678</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mn>4</mn><mo>,</mo><mn>576</mn></mrow></mtd></mtr></mtable></math>            Thử lại:       <mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>4</mn><mo>,</mo><mn>576</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>2</mn><mo>,</mo><mn>678</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thickmathspace" /><mn>7</mn><mo>,</mo><mn>254</mn></mrow></mtd></mtr></mtable></math>" id="MathJax-Element-11-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 class="mjx-mtd" id="MJXc-Node-216" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.556em;"><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;">+4<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 0.553em; white-space: pre;">,5762<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 0.553em; white-space: pre;">,6787<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 0.553em; white-space: pre;">,254<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>4</mn><mo>,</mo><mn>576</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>2</mn><mo>,</mo><mn>678</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thickmathspace"></mspace><mn>7</mn><mo>,</mo><mn>254</mn></mrow></mtd></mtr></mtable></math> <mn>7</mn><mo>,</mo><mn>284</mn><mo>&#x2212;</mo><mn>5</mn><mo>,</mo><mn>596</mn></math>" id="MathJax-Element-12-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">7<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 0.553em; white-space: pre;">,284<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;">−5<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 0.553em; white-space: pre;">,596<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>7</mn><mo>,</mo><mn>284</mn><mo>−</mo><mn>5</mn><mo>,</mo><mn>596</mn></math> ;                       <mn>0</mn><mo>,</mo><mn>863</mn><mo>&#x2212;</mo><mn>0</mn><mo>,</mo><mn>298</mn></math>" id="MathJax-Element-13-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">0<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 0.553em; white-space: pre;">,863<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;">−0<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 0.553em; white-space: pre;">,298<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>0</mn><mo>,</mo><mn>863</mn><mo>−</mo><mn>0</mn><mo>,</mo><mn>298</mn></math> Phương pháp giải:Đặt tính sao cho các chữ số cùng hàng thẳng cột với nhau.Tính theo thứ tự từ phải sang trái.Lời giải chi tiết:a)<mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>&#x2212;</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>8923</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>4157</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mn>4766</mn></mrow></mtd></mtr></mtable></math>" id="MathJax-Element-14-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 class="mjx-mtd" id="MJXc-Node-272" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.111em;"><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;">−892341574766<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>−</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>8923</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>4157</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mn>4766</mn></mrow></mtd></mtr></mtable></math>            Thử lại:       <mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>4766</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>4157</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thickmathspace" /><mn>8923</mn></mrow></mtd></mtr></mtable></math>" id="MathJax-Element-15-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 class="mjx-mtd" id="MJXc-Node-305" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.111em;"><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;">+476641578923<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>4766</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>4157</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thickmathspace"></mspace><mn>8923</mn></mrow></mtd></mtr></mtable></math><mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>&#x2212;</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>27069</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thickmathspace" /><mspace width="thinmathspace" /><mn>9537</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mn>17532</mn></mrow></mtd></mtr></mtable></math>" id="MathJax-Element-16-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 class="mjx-mtd" id="MJXc-Node-337" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.611em;"><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;">−27069953717532<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>−</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>27069</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thickmathspace"></mspace><mspace width="thinmathspace"></mspace><mn>9537</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mn>17532</mn></mrow></mtd></mtr></mtable></math>         Thử lại:      <mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>17532</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thickmathspace" /><mspace width="thinmathspace" /><mn>9537</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mn>27069</mn></mrow></mtd></mtr></mtable></math>" id="MathJax-Element-17-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 class="mjx-mtd" id="MJXc-Node-371" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.611em;"><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;">+17532953727069<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>17532</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thickmathspace"></mspace><mspace width="thinmathspace"></mspace><mn>9537</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mn>27069</mn></mrow></mtd></mtr></mtable></math>b) +) <mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>8</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow><mo>&#x2212;</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>6</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow></mstyle></math>" id="MathJax-Element-18-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">815<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;">−215<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;">=615<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"><mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>8</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow><mo>−</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>6</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow></mstyle></math>     Thử lại:  <mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>6</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow><mo>+</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>8</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow></mstyle></math>" id="MathJax-Element-19-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">615<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;">+215<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;">=815<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"><mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>6</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow><mo>+</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>8</mn><mrow class="MJX-TeXAtom-ORD"><mn>15</mn></mrow></mfrac></mrow></mstyle></math>+) <mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>&#x2212;</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>1</mn><mn>6</mn></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>&#x2212;</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>5</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow></mstyle></math>" id="MathJax-Element-20-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">712<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;">−16<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;">=712<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;">−212<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;">=512<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"><mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>−</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>1</mn><mn>6</mn></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>−</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>5</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow></mstyle></math>         Thử lại:  <mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>5</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>+</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>1</mn><mn>6</mn></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>5</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>+</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow></mstyle></math>" id="MathJax-Element-21-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">512<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;">+16<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;">=512<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;">+212<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;">=712<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"><mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>5</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>+</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>1</mn><mn>6</mn></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>5</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>+</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>2</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mrow class="MJX-TeXAtom-ORD"><mn>12</mn></mrow></mfrac></mrow></mstyle></math>+) <mstyle displaystyle="true" scriptlevel="0"><mn>1</mn><mo>&#x2212;</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>3</mn><mn>7</mn></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mn>7</mn></mfrac></mrow><mo>&#x2212;</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>3</mn><mn>7</mn></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>4</mn><mn>7</mn></mfrac></mrow></mstyle></math>" id="MathJax-Element-22-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">1<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;">−37<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;">=77<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;">−37<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;">=47<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"><mstyle displaystyle="true" scriptlevel="0"><mn>1</mn><mo>−</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>3</mn><mn>7</mn></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mn>7</mn></mfrac></mrow><mo>−</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>3</mn><mn>7</mn></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>4</mn><mn>7</mn></mfrac></mrow></mstyle></math>                 Thử lại:  <mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>4</mn><mn>7</mn></mfrac></mrow><mo>+</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>3</mn><mn>7</mn></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mn>7</mn></mfrac></mrow><mo>=</mo><mn>1</mn></mstyle></math>" id="MathJax-Element-23-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">47<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;">+37<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;">=77<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;">=1<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"><mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>4</mn><mn>7</mn></mfrac></mrow><mo>+</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>3</mn><mn>7</mn></mfrac></mrow><mo>=</mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>7</mn><mn>7</mn></mfrac></mrow><mo>=</mo><mn>1</mn></mstyle></math>c) <mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>&#x2212;</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>7</mn><mo>,</mo><mn>284</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>5</mn><mo>,</mo><mn>596</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mn>1</mn><mo>,</mo><mn>688</mn></mrow></mtd></mtr></mtable></math>" id="MathJax-Element-24-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 class="mjx-mtd" id="MJXc-Node-593" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.556em;"><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;">−7<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 0.553em; white-space: pre;">,2845<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 0.553em; white-space: pre;">,5961<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 0.553em; white-space: pre;">,688<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>−</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>7</mn><mo>,</mo><mn>284</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>5</mn><mo>,</mo><mn>596</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mn>1</mn><mo>,</mo><mn>688</mn></mrow></mtd></mtr></mtable></math>          Thử lại:      <mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>1</mn><mo>,</mo><mn>688</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>5</mn><mo>,</mo><mn>596</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mn>7</mn><mo>,</mo><mn>284</mn></mrow></mtd></mtr></mtable></math>" id="MathJax-Element-25-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 class="mjx-mtd" id="MJXc-Node-631" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.556em;"><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;">+1<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 0.553em; white-space: pre;">,6885<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 0.553em; white-space: pre;">,5967<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 0.553em; white-space: pre;">,284<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>1</mn><mo>,</mo><mn>688</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>5</mn><mo>,</mo><mn>596</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mn>7</mn><mo>,</mo><mn>284</mn></mrow></mtd></mtr></mtable></math><mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>&#x2212;</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>0</mn><mo>,</mo><mn>863</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>0</mn><mo>,</mo><mn>298</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mn>0</mn><mo>,</mo><mn>565</mn></mrow></mtd></mtr></mtable></math>" id="MathJax-Element-26-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 class="mjx-mtd" id="MJXc-Node-669" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.556em;"><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;">−0<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 0.553em; white-space: pre;">,8630<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 0.553em; white-space: pre;">,2980<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 0.553em; white-space: pre;">,565<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>−</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>0</mn><mo>,</mo><mn>863</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>0</mn><mo>,</mo><mn>298</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mn>0</mn><mo>,</mo><mn>565</mn></mrow></mtd></mtr></mtable></math>         Thử lại:       <mtable rowspacing="4pt" columnspacing="1em" rowlines="solid"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable rowspacing="4pt" columnspacing="1em"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>0</mn><mo>,</mo><mn>565</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>0</mn><mo>,</mo><mn>298</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thinmathspace" /><mspace width="thickmathspace" /><mn>0</mn><mo>,</mo><mn>863</mn></mrow></mtd></mtr></mtable></math>" id="MathJax-Element-27-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 class="mjx-mtd" id="MJXc-Node-708" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: table-cell; margin: 0px; padding: 0.221em 0.4em 0px; text-align: center; width: 3.556em;"><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;">+0<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 0.553em; white-space: pre;">,5650<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 0.553em; white-space: pre;">,2980<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 0.553em; white-space: pre;">,863<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"><mtable columnspacing="1em" rowlines="solid" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mo>+</mo><mtable columnspacing="1em" rowspacing="4pt"><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>0</mn><mo>,</mo><mn>565</mn></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mn>0</mn><mo>,</mo><mn>298</mn></mrow></mtd></mtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow class="MJX-TeXAtom-ORD"><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thinmathspace"></mspace><mspace width="thickmathspace"></mspace><mn>0</mn><mo>,</mo><mn>863</mn></mrow></mtd></mtr></mtable></math></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;">Bài 2<div style="clear: both; line-height: 26px; margin: 0px 0px 10px; padding: 0px;">Video hướng dẫn giải<div class="video-container" style="height: 0px; line-height: 26px; margin: 0px; overflow: hidden; padding: 0px 0px 326.813px; position: relative;"><iframe allowfullscreen="" data-gtm-yt-inspected-108423454_5="true" data-gtm-yt-inspected-108423454_9="true" data-gtm-yt-inspected-10="true" data-gtm-yt-inspected-16="true" frameborder="0" height="349" id="709761609" src="https://www.youtube.com/embed/X0Jx8YL7VrQ?start=600&autoplay=0&rel=0&enablejsapi=1&origin=https%3A%2F%2Floigiaihay.com" style="display: block; height: 326.813px; left: 0px; margin: 0px auto; padding: 0px; position: absolute; top: 0px; width: 581px;" title="Giải bài: Phép trừ trang 159, 160 - SGK Toán 5" width="560"></iframe></div></div>Tìm <mi>x</mi></math>" id="MathJax-Element-28-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 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;">x<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></math>:a) <mi>x</mi><mo>+</mo><mn>5</mn><mo>,</mo><mn>84</mn><mo>=</mo><mn>9</mn><mo>,</mo><mn>16</mn><mo>;</mo></math>" id="MathJax-Element-29-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 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;">x<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;">+5<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 0.553em; white-space: pre;">,84<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;">=9<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 0.553em; white-space: pre;">,16;<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><mo>+</mo><mn>5</mn><mo>,</mo><mn>84</mn><mo>=</mo><mn>9</mn><mo>,</mo><mn>16</mn><mo>;</mo></math>                                  b) <mi>x</mi><mo>&#x2212;</mo><mn>0</mn><mo>,</mo><mn>35</mn><mo>=</mo><mn>2</mn><mo>,</mo><mn>55.</mn></math>" id="MathJax-Element-30-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 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;">x<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;">−0<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 0.553em; white-space: pre;">,35<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;">=2<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 0.553em; white-space: pre;">,55.<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><mo>−</mo><mn>0</mn><mo>,</mo><mn>35</mn><mo>=</mo><mn>2</mn><mo>,</mo><mn>55.</mn></math>Phương pháp giải:Áp dụng các quy tắc:- Muốn tìm số hạng chưa biết ta lấy tổng trừ đi số hạng đã biết.- Muốn tìm số bị trừ ta lấy hiệu cộng với số trừ.Lời giải chi tiết:a) <mi>x</mi><mo>+</mo><mn>5</mn><mo>,</mo><mn>84</mn><mo>=</mo><mn>9</mn><mo>,</mo><mn>16</mn></math>" id="MathJax-Element-31-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 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;">x<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;">+5<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 0.553em; white-space: pre;">,84<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;">=9<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 0.553em; white-space: pre;">,16<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><mo>+</mo><mn>5</mn><mo>,</mo><mn>84</mn><mo>=</mo><mn>9</mn><mo>,</mo><mn>16</mn></math>    <mi>x</mi><mo>=</mo><mn>9</mn><mo>,</mo><mn>16</mn><mo>&#x2212;</mo><mn>5</mn><mo>,</mo><mn>84</mn></math>" id="MathJax-Element-32-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 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;">x<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;">=9<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 0.553em; white-space: pre;">,16<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;">−5<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 0.553em; white-space: pre;">,84<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><mo>=</mo><mn>9</mn><mo>,</mo><mn>16</mn><mo>−</mo><mn>5</mn><mo>,</mo><mn>84</mn></math>    <mi>x</mi><mo>=</mo><mn>3</mn><mo>,</mo><mn>32</mn></math>" id="MathJax-Element-33-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 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;">x<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;">=3<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 0.553em; white-space: pre;">,32<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><mo>=</mo><mn>3</mn><mo>,</mo><mn>32</mn></math>b) <mi>x</mi><mo>&#x2212;</mo><mn>0</mn><mo>,</mo><mn>35</mn><mo>=</mo><mn>2</mn><mo>,</mo><mn>55</mn></math>" id="MathJax-Element-34-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 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;">x<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;">−0<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 0.553em; white-space: pre;">,35<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;">=2<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 0.553em; white-space: pre;">,55<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><mo>−</mo><mn>0</mn><mo>,</mo><mn>35</mn><mo>=</mo><mn>2</mn><mo>,</mo><mn>55</mn></math>    <mi>x</mi><mo>=</mo><mn>2</mn><mo>,</mo><mn>55</mn><mo>+</mo><mn>0</mn><mo>,</mo><mn>35</mn></math>" id="MathJax-Element-35-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 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;">x<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;">=2<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 0.553em; white-space: pre;">,55<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;">+0<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 0.553em; white-space: pre;">,35<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><mo>=</mo><mn>2</mn><mo>,</mo><mn>55</mn><mo>+</mo><mn>0</mn><mo>,</mo><mn>35</mn></math>    <mi>x</mi><mo>=</mo><mn>2</mn><mo>,</mo><mn>9</mn></math>" id="MathJax-Element-36-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 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;">x<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;">=2<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 0.553em; white-space: pre;">,9<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><mo>=</mo><mn>2</mn><mo>,</mo><mn>9</mn></math><div style="line-height: 26px; margin: 15px 0px; padding: 0px; text-align: center;"></div></div><div class="box-question top20" id="sub-question-3" 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;">Bài 3<div style="clear: both; line-height: 26px; margin: 0px 0px 10px; padding: 0px;">Video hướng dẫn giải<div class="video-container" style="height: 0px; line-height: 26px; margin: 0px; overflow: hidden; padding: 0px 0px 326.813px; position: relative;"><iframe allowfullscreen="" data-gtm-yt-inspected-108423454_5="true" data-gtm-yt-inspected-108423454_9="true" data-gtm-yt-inspected-10="true" data-gtm-yt-inspected-16="true" frameborder="0" height="349" id="724723858" src="https://www.youtube.com/embed/X0Jx8YL7VrQ?start=737&autoplay=0&rel=0&enablejsapi=1&origin=https%3A%2F%2Floigiaihay.com" style="display: block; height: 326.813px; left: 0px; margin: 0px auto; padding: 0px; position: absolute; top: 0px; width: 581px;" title="Giải bài: Phép trừ trang 159, 160 - SGK Toán 5" width="560"></iframe></div></div>Một xã có 540,8ha đất trồng lúa. Diện tích đất trồng hoa ít hơn diện tích đất trồng lúa 385,5ha. Tính tổng diện tích đất trồng lúa và trồng hoa của xã đó.Phương pháp giải:- Tính diện tích đất trồng hoa = diện tích trồng lúa – 385,5ha.- Tổng diện tích đất trồng lúa và đất trồng hoa = diện tích trồng lúa + diện tích đất trồng hoa.Lời giải chi tiết:Tóm tắtTrồng lúa: 540,8 haTrồng hoa: ít hơn 385,5 haTổng diện tích: ...ha?Bài giảiDiện tích đất trồng hoa là:540,8 – 385,5 = 155,3 (ha)Diện tích đất trồng lúa và đất trồng hoa là: 540,8 + 155,3 = 696,1 (ha)                  Đáp số: 696,1ha. </div><div class="box-question top20" id="sub-question-4" 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;">Lý thuyết<img alt="" src="https://img.loigiaihay.com/picture/2018/0708/lt-trang-159-sgk-toan-5-th.jpg" style="height: auto; margin: 0px; max-height: 100%; max-width: 100%; padding: 0px;" /></div>

V. 10. Ôn tập về Phép trừ

Bài 1 Video hướng dẫn giải Tính rồi thử lại (theo mẫu): a) Mẫu: − 5746 1962 3784 − 5746 1962 3784 Thử lại: +...

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