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(x-y+1)^2-(x+y-3)^2
人气:277 ℃ 时间:2020-06-23 20:38:33
解答
(x-y+1)^2-(x+y-3)^2
=[(x-y+1)+(x+y-3)]*[(x-y+1)-(x+y-3)]
=(x-2)(4-2y)
=2(x-2)(2-y)
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