x的平方+y的平方+z的平方-2x+4y-6z+14=0
x^2-2x+1+y^2+4y+4+z^2-6z+9=0
(x-1)^2+(y+2)^2+(z-3)^2=0
x=1 y=-2 z=3
z+y+z=1-2+3=2是x+y+zx+y+z=1-2+3=2谢谢哈