(｜X｜- 1)(｜X｜- 1)+｜2Y+1｜=0
(｜X｜- 1)^2+｜2Y+1｜=0
(｜X｜- 1)^2=0
｜X｜=1
X=±1
｜2Y+1｜=0
y=-1/2
当X=1时
X+Y=1-1/2=1/2
当X=-1时
X+Y=-1-1/2=-3/2