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因式分解(x-y)²+6(x-y)+9
人气:118 ℃ 时间:2019-11-21 07:44:35
解答
(x-y)²+6(x-y)+9
=(x-y)²+2(x-y)×3+3²
=[(x-y)+3]²
=(x-y+3)²
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