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9(x-y)^2+12(x-y)+4因式分解
人气:493 ℃ 时间:2020-04-16 07:47:39
解答
9(x-y)^2+12(x-y)+4
=[3(x-y)]^2+12(x-y)+2^2
=[3(x-y)+2]^2
=(3x-3y+2)^2
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