数列满足前N项和为Sn,且Sn=3/2(an-1),bn=1/4bn-1-3/4(n大于等于2)且b1=3求An,Bn通

已知数列前n项和为Sn,且Sn=-2n+3,求an及Sn 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{an}a1=2前n项和为Sn 且满足Sn Sn-1=3an 求数列{an}的通项公式an已知数列{an}a1=2前n项和为Sn 且满足Sn +Sn-1=3an 求数列{an}的通项公式an 数列{an}前n项和为Sn,且2Sn+1=3an,求an及Sn 已知数列an的前n项和为Sn,且满足3an=3+2Sn.求数列an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=2/3an-1/3,且1 已知数列 {an} 的前n项和为 Sn,且满足 Sn=3/2(an-1) (n∈正整数) 求 an 的通项公式 数列（an}的前n项和为Sn,且满足an=-3Sn*Sn-1(n>=2),a1=1/3 1.证（1/Sn}是等差数列数列（an}的前n项和为Sn,且满足an=-3Sn*Sn-1(n>=2),a1=1/3 1.证（1/Sn}是等差数列 2.令bn=2(1-n)an(n>=2)求证b2平方+b3平方+.+bn平方 已知正项数列{an}的前n项和为sn,且满足sn+sn-1=kan^2+2 求an 已知数列an的前n项和为Sn,且An=3^n+2n,则Sn等于 已知数列an前n项和为Sn,且满足a1=4,Sn+Sn+1=5/3an+1 1.已知数列an的前n项和为Sn,且Sn=2^n,求通项an；2.已知数列an的前n项和为Sn,且Sn=n^2+3n,求通项an； 已知数列an前n项的和为Sn 且满足Sn=1-nan n=自然数 已知数列{an}的前n项和为Sn,且满足Sn=2an-1,n为正整数,求数列{an}的通项公式anRT , 设数列{an}的前n项和为Sn,且3Sn=an+4.（1）求数列{an}的通项公式；（2）若数列{bn}满足bn=3Sn,求数列...设数列{an}的前n项和为Sn,且3Sn=an+4.（1）求数列{an}的通项公式；（2）若数列{bn}满足bn=3Sn,求数 关于等差数列的题设数列{An}的前n项和为Sn,已知A1=1,且满足3Sn^2=An(3Sn-1)(n≥2)(1)求证:数列{1/Sn}是等差数列(2)设bn=Sn/3n+1,求数列{bn）的前n项和n 已知数列{an}的前n项和为Sn,且满足Sn=2an-1(n属于正整数),求数列{an}的通项公式an