问题描述: 2ab/(a-b)(a-c)+2bc/(a-b)(c-a) 1个回答 分类:数学 2014-11-24 问题解答: 我来补答 =2ab/(a-b)(a-c)-2bc/(a-b)(a-c)=(2ab-2bc)/(a-b)(a-c)=2b(a-c)/(a-b)(a-c)=2b/(a-b) 展开全文阅读