8.5乘0.79减0.35乘7.9

问题描述:

8.5乘0.79减0.35乘7.9
简便运算

8.5*0.79-0.35*7.9=0.85*7.9-0.35*7.9=(0.85-0.35)*7.9=0.5*7.9=3.95