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
=k,求k值. x+y z
答
①x+y+z=0时,x+y=-z,
所以,k=-1,
②x+y+z≠0时,
=x+z y
=y+z x
=k,x+y z
∴k=
=2,2(x+y+z) x+y+z
所以,k值为-1或2.