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分解因式:x2-2xy+y2-9
人气:294 ℃ 时间:2020-06-02 09:10:10
解答
x2-2xy+y2-9,
=x2-2xy+y2-9,
=(x2-2xy+y2)-9,
=(x-y)2-32
=(x-y+3)(x-y-3).
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