若x+y+z≠0且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=? 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 若有xyz≠0,2y+2z/x=2x+2y/z=2z+2x/y=k,则K= (2x+y)/z=(2y+z)/x=(2z+x)/7=k,求k x,y,z为实数 且(y-z)^2+(x-y)^2+(z-x)^2=(y+z-2x)^2+(x+z-2y)^2+(x+y x,y,z为实数且(y-z)平方+(x-y)平方+(z-x)平方=(y+z-2x)平方+(z+x-2y)平方+(x+y- 已知：(x+y-z)/z=(x-y+z)/y+(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z) 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x+y/2=y+z/3=z-2x/4=k,且知道x+2y-z=9,求k的值 x+2y-z=12,且x/2=y/3+z/2=k 求k值 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)