Tính bằng cách thuận tiện 72,7 x 54,32 – 44,32 x 72,7 2,73 x 100
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
= 72,7 x ( 54,32 - 44,32 )+ 2,73 x 100
= 72,7 x 10 + 2,73 x 100
= 727 + 273
= 1000
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=72,7\times\left(54,32-44,32\right)+273\)
\(=727+273\)
\(=1000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 4,05 × 38,6 + 4,05 × 61,54
= 4,05 × ( 38,6 + 61,54 )
= 4,05 × ( 38,6 + 61,54 )
= 4,05 × 100
= 405
b, 2,15 × 23,06 + 2,15 × 76,94
= 2,15 × ( 23,06 + 76,94 )
= 2,15 × 100
= 215
c, 72,7 × 54,32 - 44,32 × 72,7
= 72,7 × ( 54,32 - 44,32 )
= 72,7 × 10
= 727
![](https://rs.olm.vn/images/avt/0.png?1311)
\(72,7\cdot54,32-44,32\cdot72,7+27,3\)
\(=72,7\left(54,32-44,32\right)+27,3\)
\(=72,7\cdot10+27,3\)
\(=727+27,3\)
\(=754,3\)
72,7 x 54,32 - 44,32 x 72,7 + 27,3
= 72,7 x ( 54,32 - 44,32 ) + 27,3
= 72,7 x 10 + 27,3
= 727 + 27,3
= 754,3
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(2,15x23,06+2,15x76,94+17,85\)
\(=2,15x\left(23,06+76,94\right)+17,85\)
\(=2,15x100+17,85\)
\(=215+17,85\)
\(=232,85\)
b) \(72,7x54,32-44,32x72,7+27,3\)
\(=72,7x\left(54,32-44,32\right)+27,3\)
\(=72,7x10+27,3\)
\(=727+27,3\)
\(=754,3\)
a) 2,15 x 23,06 + 2,15 x 76,94 + 17,85
= 2,15 x ( 23,06 + 76,94 ) + 17,85
= 2,15 x 100 + 17,85
= 215 + 17,85
= 232,85
b) 72,7 x 54,32 - 44,32 x 72,7 + 27,3
= 72,7 x ( 54,32 - 44,32 ) + 27,3
= 72,7 x 10 + 27,3
= 727 + 27,3
= 754,3
Hok tốt !
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\dfrac{45\cdot100\cdot0.25}{35\cdot100\cdot36}=\dfrac{45}{36}\cdot\dfrac{0.25}{35}=\dfrac{5}{4}\cdot\dfrac{1}{140}=\dfrac{1}{28\cdot4}=\dfrac{1}{112}\)
72,7 x 54,32 - 44,32 x 72,7 + 27,3
= 72,7 x ( 54,32 - 44,32 ) + 27,3
= 72,7 x 10 + 27,3
= 727 + 27,3
= 754,3