问题标题:
【化简(x³+3)/(x²-1)-(x+1)/(x-1)+1等于多少?】
问题描述:

化简(x³+3)/(x²-1)-(x+1)/(x-1)+1等于多少?

刘亚林回答:
  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+...
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