若有xyz≠0,2y+2z/x=2x+2y/z=2z+2x/y=k,则K=
若有xyz≠0,2y+2z/x=2x+2y/z=2z+2x/y=k,则K=
已知x+y+z不等于0,若2y+z/x=2x+y/z=2z+x/y=k,则k=
若x+y+z不等于0且2y+z/x=2x+y/z=2z+x/y=k,k=?
若x+y+z不等于0 且 2y+z/x=2x+y/z=2z+x/y=k
已知 x,y,z都是正实数,且 x+y+z=xyz 证明 (y+x)/z+(y+z)/x+(z+x)/y≥2(1/x+1
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+y)/z=(2y+z)/x=(2z+x)/7=k,求k
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值
x*x+y*y+2z*z-2x+4y+4z+7=0,求xyz的值
若x^2y+xy^2+y^2z+yz^2+z^2x+zx^2+3xyz=k(x+y+z)*(xy+yz+zx),则k的值
若4x-3y-6z=0,x+2y-7z=0(xyz≠0),则x:y:z=______.
若xyz满足(y+z)/x=(z+x)/y=(x+y)/z=k,求k的值