3(x-y)^2-12(x-y)^2+9帮帮忙啊啊.我很急^O^
1个回答
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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