x+2y+3z=14 2x+y+z=7 3x+y+2z=11 求x y z

x+2y+3z=14 2x+y+z=7 3x+y+2z=11 求x y z 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, x+2y+3z=14 2x+y+z=7 3x+y+2z=11 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, x/2=y/3=z/5 x+3y-z/x-3y+z 如果,根号x-3+| y-2 |+z^2=2z-1 求 （x+z)^y 设x+y+z=11求函数u=2x*x+3y*y+z*z的最小值 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z {3x+2y+z=13 x+y+2z=7 2x+3y-z=12,求x,y,z 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值