问题描述: 化简(x³+3)/(x²-1)-(x+1)/(x-1)+1等于多少? 1个回答 分类:数学 2014-11-27 问题解答: 我来补答 错了,第一个是x²+3原式=(x²+3)/(x+1)(x-1)-(x+1)²/(x+1)(x-1)+(x+1)(x-1)/(x+1)(x-1)=(x²+3-x²-2x-1+x²-1)/(x+1)(x-1)=(x²-2x+1)/(x+1)(x-1)=(x--1)²/(x+1)(x-1)=(x-1)/(x+1) 展开全文阅读