f(x+4)=f(x+2+2)=(1-f(x+2))/(1+f(x+2))=(1-(1-f(x)/1+f(x)))/(1+(1-f(x)/1+f(x)))
化简一下就是(2f(x)/(1+f(x)))/(2/(1+f(x)))=f(x)
即f(x+4)=f(x)
可能有点晕.
不懂再问哦
f(x+4)=f(x+2+2)=(1-f(x+2))/(1+f(x+2))=(1-(1-f(x)/1+f(x)))/(1+(1-f(x)/1+f(x)))
化简一下就是(2f(x)/(1+f(x)))/(2/(1+f(x)))=f(x)
即f(x+4)=f(x)
可能有点晕.
不懂再问哦