小数乘除法

题目

小数乘除法
1）0.8*0.04*12.5*25 2)16.08*0.125
3)99*73.2+73.2 4)29.36/12.5/0.8
5）4.27、28.6*3.59、42.7*2.86、35.9
请用简便方法做，并且写出过程

答案

(1)0.8×0.04×12.5×25
=(0.8×12.5)×(0.04×25)
=10×1
=10
(2)16.08×0.125
=8×2.01×0.125
=8×0.125×2.01
=1×2.01
=2.01
(3)99×73.2+73.2
=99×73.2+1×73.2
=(99+1)×73.2
=100×73.2
=7320
(4)29.36÷12.5÷0.8
=29.36÷(12.5×0.8)
=29.36÷10
=2.936
(5)4.27÷28.6×3.59÷42.7×2.86÷35.9
=(4.27÷42.7)÷(28.6÷2.86)×(3.59÷35.9)
=0.1÷10×0.1
=0.001