设f(x)=x/(1-x)(x≠1),证明:f[f(x)/1+f(x)]=f(x).
由于f(x)/1+f(x)=[x/(1-x)]/[1+x/(1-x)]=x/(1-x+x)=x. 所以 f[f(x)/1+f(x)=f(x).
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