计算(-2x^3y+2x^2y^2-x^3y^3)/2x^2y

问题描述:

计算(-2x^3y+2x^2y^2-x^3y^3)/2x^2y

答:
(-2x^3y+2x^2y^2-x^3y^3)/2x^2y
=(-2x³y+2x²y²-x³y³)/(2x²y)
=xy(-2x²+2xy-x²y²)/(2x²y)
=(-2x²+2xy-x²y²)/(2x)
=-x+y-xy²/2