解得:
x+1/y=1得到y=1/(1-x)
z+1/X=1得到z=1-1/x=(x-1)/x
1/z=x/(x-1)
所以:y+1/z
=1/(1-x)+x/(x-1)
=(1-x)/(1-x)
=1
所以:
y+1/z=1