-4x^2*(1/2xy-y^2)-3(xy^2-2x^2y)

问题描述:

-4x^2*(1/2xy-y^2)-3(xy^2-2x^2y)

-4x²·(½xy-y²)-3(xy²-2x²y)
=-2x³y+4x²y²-3xy²+6x²y /化简的话,到此结束,因式分解的话,继续:
=-xy(2x²-2xy+3y-6x)