已知数列an前n项和Sn满足an+2SnS(n-1)=0 a1=1 求Sn
已知数列an的前n项和为Sn,且满足 a1=1/2,An=-2SnS(n-1) n>=2 ①求证1
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}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项和为Sn,且a1=1,Sn-S(n-1)=2SnS(n-1)
(1/2)已知数列{an}的前n项和为Sn,且满足a1=1/2,an+2SnS(n-1)=0 (n>=2,n属于N) (
一道数学题:已知数列an的前n项和为sn,满足an+2sns(n-1)=0(n≥2,n为正整数),a1=1/2
数列{an}首项a1=3通项an与前n项的Sn之间满足2an=SnS(n-1) (n>=2)
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
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}的前n项和为Sn,且满足an+2Sn+Sn-1=0(n≥2),a1+1/2
已知数列 an前n项和为Sn,a1=1,Sn=2a(n+1),求Sn
已知数列an首相a1=3,通项an和前n项和SN之间满足2an=Sn*Sn-1(n大于等于2)