Tính bằng cách thuận tiện nhất:154x18-2x53x9-6x3
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1/5x2/6x3/7x4/8 = 1/5x1/3x3/7x1/2 = (1/5x1/2) x (1/3x3/7) = 1/10 x 1/7 = 1/70
![](https://rs.olm.vn/images/avt/0.png?1311)
( 4 x 5 ) + 6 - ( 6 x 3 )
= ( 20 + 6 ) - 18
= 26 - 18
= 8
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{5}{6}\times3+\dfrac{20}{6}\times2-1:\dfrac{6}{5}\)
\(=\dfrac{5}{6}\times3-\dfrac{5}{6}+\dfrac{20}{6}\times2\)
\(=\dfrac{5}{6}\times\left(3-1\right)+\dfrac{20}{6}\times2\)
\(=\dfrac{5}{6}\times2+\dfrac{20}{6}\times2\)
\(=\left(\dfrac{5}{6}+\dfrac{20}{6}\right)\times2\)
\(=\dfrac{25}{6}\times2\)
\(=\dfrac{25}{3}\)
#DatNe
\(\dfrac{5}{6}\) \(\times\) 3 + \(\dfrac{20}{6}\) \(\times\) 2 - 1 : \(\dfrac{6}{5}\)
= \(\dfrac{5}{6}\) \(\times\) 3 + \(\dfrac{20}{6}\) \(\times\) 2 - \(\dfrac{5}{6}\)
= \(\dfrac{5}{6}\) \(\times\) 3 + \(\dfrac{5}{6}\) \(\times\) 8 - \(\dfrac{5}{6}\) \(\times\)1
= \(\dfrac{5}{6}\) \(\times\) ( 3 + 8 - 1)
= \(\dfrac{5}{6}\) \(\times\)10
= \(\dfrac{25}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
4/6x1/5+4/6x3/5+2/6x4/5
=4/6.(1/5+3/5)+2/6.4/5
=4/6.4/5+2/6.4/5
=4/5.(4/6+2/6)
=4/5.6/6
=4/5.1 = 4/5
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Đề đọc khó hiểu quá bạn. Bạn nên viết lại để mọi người hỗ trợ tốt hơn.
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 19,17x25x4=19,17(25x4)=19,17x100=1917
b)1,79x(8x125)=1,79x1000=1790
chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=21,37\cdot\left(27,5+72,4+0,1\right)=21,37\cdot100=2137\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=21,37\cdot27.5+72.4+21.37+21.37\cdot0.1\)
\(=21.37\left(27.5+72.4+0.1\right)=21.37\cdot100=2137\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=25,17\times\left(16,9-16,8\right)\\ =25,17\times1=25,17\)