问题描述： (a方+3)/(a方-1)-(a+1)/(a-1)+1 1个回答 分类：数学 2014-10-19 问题解答： 我来补答 (a²+3)/(a²-1)-(a+1)/(a-1)+1=(a²+3)/[(a+1)(a-1)]-(a+1)²/[(a+1)(a-1)]+(a²-1)/[(a+1)(a-1)]=[(a²+3)-(a²+2a+1)+(a²-1)]/[(a+1)(a-1)]=(a²+3-a²-2a-1+a²-1)/[(a+1)(a-1)]=(a²-2a+1)/[(a+1)(a-1)]=(a-1)²/[(a+1)(a-1)]=(a-1)/(a+1) 展开全文阅读
