[X(X^2Y^2-XY)-Y(X^2-2X^3Y)]/（X^2Y）=[x³y²-x²y-x²y+2x³y²]/(x²y)=[3x³y²-2x²y]/(x²y)=x²y[3xy-2)/(x²y)=3xy-2【中学生数理化】团队为您答题....谢谢，不过=[x³y²-x²y-x²y+2x³y²]/(x²y)=[3x³y²-2x²y²]/(x²y)有毛病吧你再刷一下不客气