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Tính bằng cách thuận tiện nhất:
9/4 x 15/11 + 3/4 : 11/7 - 3/4 x 8/11
[Lưu ý trình bày cách làm ra!]
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{9}{4}\times\dfrac{15}{11}+\dfrac{3}{4}:\dfrac{11}{7}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times3\times\dfrac{15}{11}+\dfrac{3}{4}\times\dfrac{7}{11}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times\dfrac{45}{11}+\dfrac{3}{4}\times\dfrac{7}{11}-\dfrac{3}{4}\times\dfrac{8}{11}\)
\(=\dfrac{3}{4}\times\left(\dfrac{45}{11}+\dfrac{7}{11}-\dfrac{8}{11}\right)\)
\(=\dfrac{3}{4}\times4\)
\(=3\)
`9/4xx15/11+3/4:11/7-3/4xx8/11`
`=3/4xx15/11xx3+3/4xx7/11-3/4xx8/11`
`=3/4xx45/11+3/4xx7/11-3/4xx8/11`
`=3/4xx(45/11+7/11-8/11)`
`=3/4xx4`
`=3`
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(36+54\right)\times8+8\times9+8=90\times8+8\times9+8=\left(90+9+1\right)\times8=100\times8=800\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
8 x 2.019 x 125 - 250 x 2.018 x 4
= (8 x 125) x 2.019 - (250 x 4) x 2.018
= 1.000 x 2.019 - 1.000 x 2.018
=2.019.000 - 2.018.000
= 1.000
nhớ tick nhe
![](https://rs.olm.vn/images/avt/0.png?1311)
(54 x 48) : 24 = 1592 : 24=108
giúp mình với