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数学
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分解因式 3m^2-3+7m^2y+7y
人气:105 ℃ 时间:2020-05-02 11:23:50
解答
=3m²-3+7m²y-7y
=(3m²+7m²y)-(3+7y)
=m²(3+7y)-(3+7y)
=(3+7y)(m²-1)
=(3+7y)(m+1)(m-1)
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