x/(x+y)(x-y)的三次方,y/(y+x)(y-x)的平方通分
问题描述：
x/(x+y)(x-y)的三次方,y/(y+x)(y-x)的平方通分
答
x/(x+y)(x--)^3=x/(x+y)(x--y)^3
y/(y+x)(y--x)^2=y(x--y)/(x+y)(x--y)^3.