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化简(a^2/a-1)-a-1的结果是
人气:260 ℃ 时间:2020-05-14 10:16:30
解答
=a²/(a-1)-(a+1)
=a²/(a-1)-(a+1)(a-1)/(a-1)
=[a²-(a+1)(a-1)]/(a-1)
=(a²-a²+1)/(a-1)
=1/(a-1)
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