x²+y²+z²+2x-4y+6z+14=0x²+y²+z²+2x-4y+6z+1+4+9=0x^2+2x+1+y^2-4y+4+z^2+6z+9=0(x+1)^2+(y-2)^2+(z+3)^2=0所以 x=-1,y=2,z=-3x+y+z=-1+2-3=-2