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数学
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因式分解:x^2-6xy+9y^2+x^2y-9y^3
人气:220 ℃ 时间:2019-11-11 04:32:57
解答
x^2-6xy+9y^2+x^2y-9y^3
=(x-3y)^2 +y(x^2-9y^2)
=(x-3y)^2 +y(x+3y)(x-3y)
=(x-3y)(x-3y+xy+3y^2)
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