化简 a²-1分之a²+3-a-1分之a+1+1a²-1分之a²+3-【a-1分之a+1】+1【】是个整体

化简 a²-1分之a²+3-a-1分之a+1+1a²-1分之a²+3-【a-1分之a+1】+1【】是个整体
化简 a²-1分之a²+3-a-1分之a+1+1
a²-1分之a²+3-【a-1分之a+1】+1
【】是个整体

化简 a²-1分之a²+3-a-1分之a+1+1a²-1分之a²+3-【a-1分之a+1】+1【】是个整体
a²-1分之a²+3-【a-1分之a+1】+1
=（a²+3-(a+1)²+a²-1）/(a²-1)
=(a²+3-a²-2a-1+a²-1)/(a²-1)
=-1;
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