已知x+y+z不等于0,若2y+z/x=2x+y/z=2z+x/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= 已知x+y-7z=0 x-2y+5z=0(xyz不等于0）,求x+2y-z/y-2x+12z 已知xyz不等于0,且x+2y-z=0,7x-y-z=0,求x+y+z/2x-y-z的值. 已知2x-y-3z=0 x-2y+z=0,且x、y、z都不等于0,求x：y：z 已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值 已知方程组{2x-3y+z=0 且x*y*z不等于0 求 x：y：z {3x-2y-6z=0 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 已知x+y+z=0,xyz不等于0化简:(x^2/y+z)+(y^2/x+z)+(z^2/x+y) 已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值 已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值 已知:(x+y)/z=(x+z)/y=(z+y)/x,且xyz不等于0,则分式(x+y)(x+z)(z+x)/xyz的值为? 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 已知xyz不等于0,且{x+3y+5z=0 x2+3y+z=0,则x.x+y.y-2z.2z/3x.3x+2y.2y+z.z=? 若xy-z不等于0,且(y+x)/x=(z+x)/y=(y+x)/z,求[(y+z)(z+x)(x+y)]/xyz的值? 已知z不等于0,x、y、z满足4x-7y-5x=0,2x-y-z=0.求x：y 若x、y、z均不等于0,且2x+y-z=0 x+8y+2z=0,则x:y:z=? 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