Question

简便计算 （1）125×0.25× 32

简便计算
（1）125×0.25× 32 （2）（4分之3-2分之1-6分之1）×24
（3）2.5×7分之5×0.4×2又3分之1

Answer 1

（1）125×0.25× 32 =125X8X4X0.25=1000X1=1000
（2）（4分之3-2分之1-6分之1）×24=3/4X24-1/2X24-1/6X24=18-12-4=2
（3）2.5×7分之5×0.4×2又3分之1=10/4X5/7X4/10X7/3=10/4X4/10X5/7X7/3=5/3

Answer 2

（1）先算后面的。结果是125*8=1000

2.全部拆开：18-12-4=2
3.第二个数和第三个先算，下一步再和最后面一个算，最后面一个换成假分数。结果5/3

Answer 3

125×0.25×32
=125×0.25×（8×4）
=125×8×（0.25×4）
=1000×1
=1000
(3/4-1/2-1/6)×24
=3/4×24-1/2×24-1/6×24
=18-12-4
=2
2.5×5/7×0.4×7/3
=2.5×0.4×(5/7×7/3)
=1×5/3
=5/3

Answer 4

（1）原式=125×（0.25×4）×8=125×8=1000
（2）原式=3/4×24-1/2×24-1/6×24=18-12-4=2

（3）原式=5/2×5/7×2/5×7/3=5/2×2/5×5/7×7/3=5/3

Answer 5

（1）
=125X8X4X0.25
=1000X1
=1000
(2)
=3/4X24-1/2X24-1/6X24
=18-12-4
=2
（3）
=10/4X5/7X4/10X7/3
=10/4X4/10X5/7X7/3
=5/3 三分之五