约分(x²y+xy²)/(xy³-x³y)

问题描述:

约分(x²y+xy²)/(xy³-x³y)
算了 自己算出了 1/y-x

解(x²y+xy²)/(xy³-x³y)
=xy(x+y)/xy(y²-x²)
=(x+y)/(y²-x²)
=(x+y)/(y-x)(y+x)
=1/(y-x)算了就选你吧自己做出了谢谢