x^2+4y^2+z^2-2x+4y-6z+11=0
(x²-2x+1)+(4y²+4y+1)+(z²-6z+9)=0
(x-1)²+(2y+1)²+(z-3)²=0
得:
x-1=0且2y+1=0且z-3=0
则:x=1、y=-1/2、z=3
x+y+z=7/2
x^2+4y^2+z^2-2x+4y-6z+11=0
(x²-2x+1)+(4y²+4y+1)+(z²-6z+9)=0
(x-1)²+(2y+1)²+(z-3)²=0
得:
x-1=0且2y+1=0且z-3=0
则:x=1、y=-1/2、z=3
x+y+z=7/2