6.4乘12.5乘0.25怎么巧算

分类: 作业答案 • 2021-12-03 15:46:40

问题描述：

6.4乘12.5乘0.25怎么巧算

答

6.4×12.5×0.25
=0.8×8×12.5×0.25
=0.8×12.5×0.25×8
=10×0.25×8
=10×0.25×4×2
=10×1×2
=10×2
=20