|4x-4y+1|+1/3*√(2y+z)+(z^2-z+1/4)=0
|4x-4y+1|+1/3*√(2y+z)+(z-1/2)^2=0
则
4x-4y+1=0
2y+z=0
z-1/2=0
解得
z=1/2
y=-1/4
x=-1/2