分解因式x^2-x^2y-xy^2+y^3

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分解因式x^2-x^2y-xy^2+y^3
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分解因式x^2-x^2y-xy^2+y^3
分解因式x^2-x^2y-xy^2+y^3

分解因式x^2-x^2y-xy^2+y^3
应该为x^3-x^2y-xy^2+y^3吧!
=(x^3+y^3)-(x^2y+xy^2)
=(x+y)(x^2-xy+y^2)-xy(x+y)
=(x+y)(x^2-2xy+y^2)
=(x+y)(x-y)^2