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因式分解:(x-y)的平方-8(x-y-2)等于?
人气:429 ℃ 时间:2020-02-27 22:47:23
解答
(x-y)^2-8(x-y-2)
=(x-y)^2-8(x-y)+16
=[(x-y)-4]^2
=(x-y-4)^2
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