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(x-y)的三次方+9(x-y)-6(x-y)的平方
人气:240 ℃ 时间:2020-05-13 20:13:31
解答
(x-y)^3+9(x-y)-6(x-y)^2
=(x-y)[(x-y)^2-6(x-y)+9]
=(x-y)[(x-y)-3]^2
=(x-y)(x-y-3)^2
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