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22.(本小题满分14分)已知数列{an} 满足a1 =, an+1 =(n=1,2,…)
(1)求数列{an}的通项
(2)设数列{bn}满足an (bn + a1)=1,
求证:对任意,n>1,n∈N*,bn+1 + bn+2+…+ b2n+ b4n+1<
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