数列an的前n项和为Sn,a1=1,2Sn=a(n+1)-n^2/3-n-2/3
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
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}的首项a1=3,前n项和为Sn,且S(n+1)=3Sn+2n(n∈N)
设数列{an}的前n项和为sn,已知a1+2a2+3a3+…+nan=(n-1)Sn+2n(n∈N*)
数列{an}的前n项和为Sn,a1=1,an+1=2Sn(n∈N*)
已知数列 an前n项和为Sn,a1=1,Sn=2a(n+1),求Sn
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,
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
高二数列题目数列{an}的前n项和为Sn,a1=1,a(n+1)=(n+2)Sn\n,n=1,2,3……求证:1.{Sn
数列{an}的前n项和为Sn,a1=1,a(n+1)=2Sn(n属于N*)求数列通项
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
数列{an}的前n项和为Sn,已知A1=a,An+1=Sn+3^n(三的n次方),n∈N*