(2x^3-3x^2y-2xy^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)
=2x^3-3x^2y-2xy^2-x^3+2xy^2-y^3-x^3+3x^2y-y^3
=2x^3-x^3-x^3+3x^2y-3x^2y+2xy^2-2xy^2-y^3-y^3
=-2y^3
经化简多项式的值与x无关,
(2x^3-3x^2y-2xy^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)
=2x^3-3x^2y-2xy^2-x^3+2xy^2-y^3-x^3+3x^2y-y^3
=2x^3-x^3-x^3+3x^2y-3x^2y+2xy^2-2xy^2-y^3-y^3
=-2y^3
经化简多项式的值与x无关,