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计算:a²/a-1-a-1(过程)
人气:101 ℃ 时间:2020-06-16 21:04:39
解答
a²/(a-1)- (a-1)
=a²/(a-1) - (a-1)²/(a-1)
=(a²-a²+2a-1)/(a-1)
=(2a-1)/(a-1)
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