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数学
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3(x-y)^2-12(x-y)^2+9帮帮忙啊啊.我很急^O^
人气:286 ℃ 时间:2020-06-26 23:56:03
解答
3(x-y)^2-12(x-y)^2+9
=-9(x-y)²+9
=-9[(x-y)²-1]
=-9(x-y+1)(x-y-1)
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