Question

12.5×0.25×0.4×3.2，简便计算？

Answer 1

12.5x0.25x0.4x3.2
=（12.5x3.2）x（0.25x0.4）…乘法交换律和乘法结合律
=12.5x0.8x4x0.1
=10x4x0.1
=0.4

Answer 2

先0.25*0.4=0.1，再把3.2拆成1.6*2，2和12.5乘
即 原式=12.5*0.1*1.6*2
=25*0.16
=25*0.4*0.4
=4

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Answer 3

12.5×0.25×0.4×3.2
=12.5×（0.25×0.4）×4×0.8
=（12.5×0.4）×(0.25×0.4)×0.8
=5×1×0.8
=4

Answer 4

12.5*0.25*0.4*3.2=（12.5*3.2）*（0.25*0.4）=（12.5*0.8*4）*0.1=（10*4）*0.1=4

Answer 5

用乘法交换律，12.5*0.25*4=12.5*1*3.2=12.5*0.8*4=10*4=40