0.25 x 7.9 x 0.5简便算法

分类: 作业答案 • 2022-01-28 08:27:53

问题描述：

答

0.25*7.9*0.5
=0.25x0.5x(8-0.1)
=0.25x0.5x8-0.25x0.5x0.1
=0.125x8-0.125x0.1
=1-0.0125
=9.9875