关于t的二次方程t^2+(2+i)t+2xy+(x-y)i=0(x,y属于R),
(t^2+2t+2xy)+(t+x-y)i=0
t^2+2t+2xy=0,t+x-y=0
由上两式消去t得:
点P的轨迹方程:x^2+y^2+2y-2x=0