数列an的前n项和为Sn,已知a1=1,an+1=(n+2)Sn/n(n=1,2,3····),证明数列{Sn/n}
数列An的前n项和为Sn,已知A1=1,An+1=Sn*(n+2)/n,证明数列Sn/n是等比数列
已知数列an的前n项和为Sn,且满足an+2Sn·S(n-1)=0(n≥2),a1=1.5
数列an的前n项和为Sn,a1=1,2Sn=(n+1)an(n为正自然数) 1.证明an=(n/(n
已知数列的前n项和为Sn,且an=Sn·Sn-1(n>=2),a1=2/9,则a10=
已知数列{an}的首项是a1=1,前n项和为Sn,且Sn+1=2Sn+3n+1(n∈N*).
已知数列{an}的前n项和为Sn,a1=-23,Sn+1Sn=an-2(n≥2,n∈N)
数列{an}的前n项和为Sn,已知a1=1/2,Sn=n^2an-n(n-1) (1)证明:数列{(n+1)/n*Sn}
数列{an}的前n项和为Sn,已知a1=1/2,Sn=n^2an-n(n-1) (1)证明:数列{[﹙n+1)Sn]/n
设数列an的前n项和为Sn,a1=1,an=(Sn/n)+2(n-1)(n∈N*) 求证:数列an为等差数列,
已知数列 an前n项和为Sn,a1=1,Sn=2a(n+1),求Sn
数列{an}的前n项和为Sn,a1=1,an+1=2Sn(n∈N*)
设数列an的前n项和为Sn,已知a1=1,(2Sn)/n=a(n+1)-1/3n^2-n-2/3