设f1(x)=2/(1+x),fn+1(x)=f1[fn(x)]设f1(x)=2/(1+x),设fn+1(x)=f1〔fn(x)〕,an=〔fn(0)-1〕/〔fn(0)+2〕,n∈N*,求数列{an}的2009项
问题描述:
设f1(x)=2/(1+x),fn+1(x)=f1[fn(x)]
设f1(x)=2/(1+x),设fn+1(x)=f1〔fn(x)〕,an=〔fn(0)-1〕/〔fn(0)+2〕,n∈N*,求数列{an}的2009项
答