(x-z-20)²+(3x-6y+3)²+|3y+2z-8|=0
(x-z-20)²大于等于0
(3x-6y+3)²大于等于0
|3y+2z-8|大于等于0
所以他们都等于0
x-z-20=0
3x-6y+3=0
3y+2z-8=0
解出xyz