2x=3y+6z+11 3y=2x+6z+11 6z=2x+3y+11 求x y z各是多少
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
2x+3y+z=11,3x+y-z=2,x+y+z=6求解
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
2x=3y+6z+11 3y=2x+6z+11 6z=2x+3y+11 求x y z各是多少
已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少
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x/4=y/5=z/6 求x+y+z/3x-2y+z的值
已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值.
已知2x+5y+4z=6 3x+y-7z=-4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)
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.