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分解因式7x^2-3y+xy-21x
人气:267 ℃ 时间:2020-05-21 15:28:34
解答
7x^2-3y+xy-21x
=7x^2+xy-3y-21x
=x(7x+y)-3(y+7x)
=(7x+y)(x-3)
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