已知数列{an},满足an=1/2n(2n+2),求前n项和Sn.
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已知数列{an},满足an=1/2n(2n+2),求前n项和Sn.
已知数列{an},满足an=1/2n(2n+2),求前n项和Sn.
已知数列{an},满足an=1/2n(2n+2),求前n项和Sn.
an=1/4 ×(1/n - 1/(n-1))
所以,Sn=1/4 × (1- 1/(n+1))=1/4 × n/(n-1)
an=0.25*(1/n-1/(n+1)),sn=0.25*(1-1/(n+1)).
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