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?
答
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