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化简 (x^2-2xy+y^2-1)/(x-y-1)
人气:145 ℃ 时间:2020-06-03 06:20:02
解答
x^2-2xy+y^2-1
=(x-y)^2-1^2
=(x-y+1)(x-y-1)
所以原式=(x-y+1)(x-y-1)/(x-y-1)=x-y+1
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