x^2+y^2+z的平方-2x加4y-6z+14
=x²-2x+1+y²+4y+4+z²-6z+9
=(x-1)²+(y+2)²+(z-3)²=0
(x-1)²>=0,(y+2)²>=0,(z-3)²>=0
三个非负数之和为0,则每个都为0
x-1=y+2=z-3=0
x=1,y=-2,z=3
x+y+z=2
解答:
因为:x^2+y^2+z^2-2x+4y-6z+14=0,所以:(x-1)^2+(y+2)^2+(z-3)^2=0
所以:x-1=0,y+2=0,z-3=0
解得:x=1,y=-2,z=3
所以:x+y+1-2+3=2
(X-1)²+(Y+2)²+(Z-3)²=0
X=1,Y=-2,Z=3
X+Y+Z=1-2+3=2
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