化简3x^2y-3y^2x+2xy^2-2x^2y,其中x=1/2,y=-1
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化简3x^2y-3y^2x+2xy^2-2x^2y,其中x=1/2,y=-1
化简3x^2y-3y^2x+2xy^2-2x^2y,其中x=1/2,y=-1
化简3x^2y-3y^2x+2xy^2-2x^2y,其中x=1/2,y=-1
3x^2y-3y^2x+2xy^2-2x^2y
=x^2y-y^2x
=xy(x-y)
∵x=1/2,y=-1
∴xy(x-y)=-3/4
∴3x^2y-3y^2x+2xy^2-2x^2y=-3/4
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