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约分x-y-1分之(x-y)的平方-1=()
人气:328 ℃ 时间:2020-05-12 04:35:19
解答
(x-y)²-1=(x-y+1)(x-y-1)
∴原式=(x-y+1)(x-y-1) /(x-y-1) =x-y+1
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