若x+y+z不为零,2x+y/z=2y+z/x=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,k=?
若x+y+z不等于0 且 2y+z/x=2x+y/z=2z+x/y=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-
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
若x2+y2+z2=(x+y+z)2,且x,y,z均不为零,则x+y+z/xyz=?
若xyz满足(y+z)/x=(z+x)/y=(x+y)/z=k,求k的值
若有xyz≠0,2y+2z/x=2x+2y/z=2z+2x/y=k,则K=
(x+y-z)(x-y+z)=
(x+y-z)^2-(x-y+z)^2=?