先化简再求值:2a+2/a-1÷(a+1)+a²-1/a²-2a+1,其中a=0
问题描述:
先化简再求值:2a+2/a-1÷(a+1)+a²-1/a²-2a+1,其中a=0
答
2a+2/a-1÷(a+1)+a²-1/a²-2a+1
=2(a+1)/(a-1)÷(a+1)+(a+1)(a-1)/(a-1)²
=2/(a-1)+(a+1)/(a-1)
=(a+3)/(a-1)
=3/-1
=-3
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