计算 2a+2/a-1 ÷(a+1)- a²-1 - 知识问答

计算 2a+2/a-1 ÷(a+1)- a²-1 /a²-2a+1要完整的过程

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2a+2/a-1 ÷(a+1)- a²-1 /a²-2a+1
=2（a+1）/(a-1)×1/(a+1)-(a+1)(a-1)/(a-1)²
=2/(a-1)-(a+1)/(a-1)
=(1-a)/(a-1)
=-1;
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