[(0.75+五分之一)÷0.25+五分之二】×二分之五

问题描述:

[(0.75+五分之一)÷0.25+五分之二】×二分之五
要简便算法——⊙﹏⊙b汗

[(0.75+1/5)÷0.25+2/5】×5/2
=[0.95/0.25+2/5]*5/2
=[3.8+2/5]*5/2
=4.2*5/2
=10.5