应该有括号吧?
(y+z)分之x=(z+x)分之y=(x+y)分之z
x/(y+z)=y/(z+x)=z/(x+y)
x/(y+z)=y/(z+x)
xz+x²=y²+yz
x²-y²=yz-xz
(x+y)(x-y)=z(y-x)
当x=y时,由于他们是对称的,所以x=y=z,z分之x+y=(x+y)/z=2
当x≠y时,x+y=-z,(x+y)/z=-1