xy(x+y)=x3+y3-5,解方程
问题描述：
xy(x+y)=x3+y3-5,解方程
答
x2y+xy2=x3+y3-5
x2(y-x)+y2(x-y)=-5
(x-y)(x2-y2)=5
(x-y)2*(x+y)=5