Question

1.25×0.25×0.4×3.2，简便计算？

Answer 1

1.25×0.25×0.4×3.2
=(1.25x3.2) x (0.25×0.4)
= (1.25x8x0.4)x0.1
=(10x0.4)x0.1
=4x0.1
=0.4

Answer 2

1.25×0.25×0.4×3.2
=1.25×0.25×0.4×0.8×4
=（1.25×0.8）×（0.25×4）×0.4
=1×1×0.4
=0.4

Answer 3

这样的题可以运用乘法交换律和乘法结合律进行简便运算。
1.25x0.25x0.4x3.2
=1.25x3.2x（0.25x0.4）
=1.25x8x0.4x0.1
=10x0.4x0.1
=0.4

Answer 4

1.25*0.25*0.4*3.2
=0.25*0.4*1.25*3.2
=0.1*1.25*3.2
=1.25*8*0.4
=10*0.4
=4

Answer 5

1.25*0.25*0.4*3.2
=1.25*3.2*0.25*0.4
=(1.25*8)*(0.4*0.25)*0.4
=10*0.1*0.4
=1*0.4
=0.4