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x的3次方-3x的平方y+3xy的平方-y的3次方 分解因式
人气:100 ℃ 时间:2019-08-18 00:37:25
解答
x^3-3x^2y+3xy^2-y^3
=(x^3-y^3)-(3x^2y-3xy^2)
=(x-y)(x^2+xy+y^2)-3xy(x-y)
=(x-y)(x^2+xy+y^2-3xy)
=(x-y)(x^2-2xy+y^2)
=(x-y)(x-y)^2
=(x-y)^3
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