2x+ 3y +6z=x +y+ z+ 11 x y z各是多少
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
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
2x+3y+z=11,3x+y-z=2,x+y+z=6求解
(x+y-z)(x-y+z)=
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
2x=3y+6z+11 3y=2x+6z+11 6z=2x+3y+11 求x y z各是多少
x/2=y/3=z/5 x+3y-z/x-3y+z
已知x=y/3=z/5.且x+y-2z不等于0.求2x+3y-z/x+y-2z的值是多少
(y-x)/(x+z-2y)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z
已知x、y、z满足方程组:x+y-z=6;y+z-x=2;z+x-y=0 求x、y、z的值
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3