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数学
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a<1时,化简(a²-2a+1)/(a²-1)
人气:411 ℃ 时间:2020-04-05 15:56:57
解答
(a²-2a+1)/(a²-1)
=(a-1)²/(a-1)(a+1)
=1/(a+1)
因为a<1,所以(a-1)²>1,(a+1)无论结果怎样,原式=1/a+1.
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