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a-2/a²-1÷(a-1-(2a-1)/a+1计算
人气:492 ℃ 时间:2020-04-12 06:57:03
解答
原式=(a-2)/(a+1)*(a-1)/[(a^2-1-2a+1)/(a+1)]
=(a-2)/(a+1)*(a-1)*(a+1)/[a(a-2)]
=1/[a(a-1)]
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