2a-3b
=2(3x^2y-4y^3)-3(-x^2y^2+2y^3)
=6x^2y-8y^3+3x^2y^2-6y^3
=6x^2y+3x^2y^2-14y^3
已知a=3x^2y-4y^3,b=-x^2 y^2+2y^3 则2a-3b=?
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