先化简再求值(1+1/a²-1)÷a/a-1,其中a=-3
问题描述:
先化简再求值(1+1/a²-1)÷a/a-1,其中a=-3
答
(1+1/a²-1)÷a/a-1
=(a²-1+1)/(a+1)(a-1)÷a/a-1
=a²/(a+1)÷a
=a/(a+1)
=-3/(-3+1)
=1.5
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