问题描述: (1/2-1/4)÷(1-3/4*4/5)怎么做?还有1-(5/7+3/14÷3/4)*2/7 1个回答 分类:数学 2014-11-18 问题解答: 我来补答 (1/2-1/4)÷(1-3/4*4/5) =(2/4-1/4)÷(1-3/5) =(1/4)÷(2/5) =(1/4)*(5/2) =5/8 1-(5/7+3/14÷3/4)*2/7 =1-(5/7+(3/14)*(4/3))*2/7 =1-(5/7+2/7)*2/7 =1-2/7 =5/7希望采纳 展开全文阅读