已知正项数列{an}的前n项和为Sn,a1=2/3,且满足2S(n+1)+2Sn=3(an+1)^2(n属于N*)
3个回答
(1)an=2n/3(递推一项,两式相减得an与an+1关系)
(2)即求n>=2时,∑1/n^2
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