计算(2x^3-3x^2y-2xy^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)
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计算(2x^3-3x^2y-2xy^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)
![计算(2x^3-3x^2y-2xy^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)](/uploads/image/z/7473790-46-0.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%882x%5E3-3x%5E2y-2xy%5E2%EF%BC%89-%EF%BC%88x%5E3-2xy%5E2%2By%5E3%EF%BC%89%2B%EF%BC%88-x%5E3%2B3x%5E2y-y%5E3%EF%BC%89)
=2x^3-3x^2y-2xy^2-x^3+2xy^2-y^3-x^3+3x^2y-y^3
=-2y^3
=-2y^3
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