已知x+z/y=y+z/x=x+y/z=k,求k值.

问题描述:

已知

x+z
y
=
y+z
x
=
x+y
z
=k,求k值.

①x+y+z=0时,x+y=-z,
所以,k=-1,
②x+y+z≠0时,

x+z
y
=
y+z
x
=
x+y
z
=k,
∴k=
2(x+y+z)
x+y+z
=2,
所以,k值为-1或2.