数列{an}的前n项和记作sn,满足sn=2an+3n-12(1)证明数列{an-3}为等比数列,并求出数列{an}的通项公式.(2)记bn=n*an,数列{bn}的前n项和为Tn,求Tn.

数列an的前n项和Sn满足：Sn=2n-an 求通项公式 已知数列｛an｝的前n项和为sn,且满足sn＝n 已知数列an的前n项和sn满足sn=n的平方+2n-1求an 数列an的前n项和Sn满足Sn=2n/n+1,求an? 已知数列an的前n项和sn与通项an满足a1=2,sn+1sn=an+1,求sn 已知数列{an}的前n项和sn满足sn=an^2+bn,求证{an}是等差数列 已知数列{an}的前n项和sn满足log2(sn+1)=n+1求通项公式an 数列{an}的前n项和Sn满足log2(Sn+1)=n+1则an= 数列{an}的前n项和Sn满足log2^(Sn-1)=n+1,则an= 已知数列{an}的前n项和Sn满足log2（Sn+1）=n,则an=? 数列{an}的前n项和,Sn满足log2(Sn+1)=n+1,则an= 已知数列{an}的前n项和sn满足lg(sn+1)=n+1求通项公式an 已知数列{an}的前n项和为Sn,且满足an+2Sn*Sn-1=0,a1=1/2.求证：{1/Sn}是等差数列 已知数列的前n项和sn满足2sn-3an+2n=0(n 求:设数列 {an}的前n项和为Sn,数列{Sn}的前n项和为Tn,满足Tn=2Sn一n²,n∈求:设数列 {an}的前n项和为Sn,数列{Sn}的前n项和为Tn,满足Tn=2Sn一n²,n∈N 已知数列{an}的前n项和Sn满足Sn=2/3an-1/3,且1 如题：一直数列｛an｝的前n项和Sn与an满足：an,Sn,Sn-1/2（n大于等于2）成等比数列,且a1=1,求数列｛an｝的前n项和Sn. (1)已知数列an的前n项和为sn满足sn=an²+bn,求证an是等差数列(2)已知等差数列an的前n项和为sn,求证数列sn/n也成等差数列