6.4乘12.5乘0.25怎么巧算_数学解答

6.4乘12.5乘0.25怎么巧算

人气：183 ℃　时间：2020-05-14 10:32:26

解答

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