已知A=x^3+3x^2y-5xy^2+6y^3-1,B=y^3+2xy^2+x^2y-2x^3+2,C=x^3-4x^2y+3xy^2-7y^3+1,求证2A+2B+2C的值急!速来回答!

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已知A=x^3+3x^2y-5xy^2+6y^3-1,B=y^3+2xy^2+x^2y-2x^3+2,C=x^3-4x^2y+3xy^2-7y^3+1,求证2A+2B+2C的值急!速来回答!

已知A=x^3+3x^2y-5xy^2+6y^3-1,B=y^3+2xy^2+x^2y-2x^3+2,C=x^3-4x^2y+3xy^2-7y^3+1,求证2A+2B+2C的值急!速来回答!
已知A=x^3+3x^2y-5xy^2+6y^3-1,B=y^3+2xy^2+x^2y-2x^3+2,C=x^3-4x^2y+3xy^2-7y^3+1,求证2A+2B+2C的值
急!速来回答!

已知A=x^3+3x^2y-5xy^2+6y^3-1,B=y^3+2xy^2+x^2y-2x^3+2,C=x^3-4x^2y+3xy^2-7y^3+1,求证2A+2B+2C的值急!速来回答!
= 4

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