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因式分解:4+12(x-y)+9(x-y)²
过程~~~~~~~~~~~~~~~
人气:490 ℃ 时间:2020-03-19 17:05:09
解答
4+12(x-y)+9(x-y)²
=9(x-y)²+12(x-y)+4
=[3(x-y)+2]²
=(3x-3y+2)²
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