数列an满足a1=2an+1=2n+1an/【(n+1/2)an+1+2n】(1)bn=2n/an求bn通向(2)设cn=1/n(n+1)an+1(底n+1项求数列cn的前n项和sn并由此证明5/16≤sn<1/2
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