4x^2+4x+y^2-2y+2=0,则x^3y-y^3x得值是?

问题描述:

4x^2+4x+y^2-2y+2=0,则x^3y-y^3x得值是?

4x^2+4x+1+y^2-2y+1=0
整理得:(2x+1)^2+(y-1)^2=0
x=-1/2;y=1
代入得:3/8