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22.(本小題滿分14分)已知數(shù)列{an} 滿足a1 =, an+1 =(n=1,2,…)
(1)求數(shù)列{an}的通項(xiàng)
(2)設(shè)數(shù)列{bn}滿足an (bn + a1)=1,
求證:對(duì)任意,n>1,n∈N*,bn+1 + bn+2+…+ b2n+ b4n+1<
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