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}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的前n项和Sn满足An+2Sn*Sn-1=0,n大于等于2,A1=1/2,求An. 已知数列{an}的前n项和为Sn,且满足Sn=Sn-1/2Sn-1 +1,a1=2,求证{1/Sn}是等差数列 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｝的首项a1=1,其前n项和Sn与an之间满足an=2Sn^2/｛2（Sn）-1｝(1)求数列{an}的通 已知数列{an}的前N项和Sn与an之间满足a1=1,Sn=n的平方*an,求{an} 已知数列{an}的前N项和为Sn与an满足：an,Sn,Sn-1/2（n大于2）成等比数列,且a1=1,求Sn 已知数列An中,其前n项和为Sn,A1=1,且An+1=2Sn,求An的通项公式和Sn 数列{an}的首项a1=1,前n项和Sn与an之间满足an=2Sn^2/2Sn -1 (n>=2) 已知数列{an}的各项都为正数,a1=1,前n项和Sn满足Sn-Sn-1=根号Sn+根号Sn-1（n≥2),求数列{an 数列｛an}的前n项和为Sn,已知a1+2,Sn+1=Sn-2nSn+1Sn,求an 已知数列{an}的前n项和满足a1=1/2,an=-Sn*S(n-1),(n大于或等于2）,求an,Sn