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因式分解:9(x-y)²-12(x-y)+4=
人气:355 ℃ 时间:2019-12-27 10:27:47
解答
9(x-y)^2-12(x-y)+4=[3(x-y)]^2-2*3*2(x-y)+2^2=[3(x-y)-2]^2=(3x-3y-2)^2
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