Question

化简并求职：（2x^2/y-2xy^2)-((-3x^3y^2+3x^2y)+(3x^2*y^2-3xy^2)).其中x

Answer 1

（2x^2/y-2xy^2)-((-3x^3y^2+3x^2y)+(3x^2*y^2-3xy^2))

=2x²/y-2xy²-3x³y²+3x²y+3x²y²-3xy²

=2x²/y-5xy²-3x²y（x-1-y)

x=-1、y=2

=1+20-0

=21