已知{an}的前n项和为sn,且满足an+2SnS(n-1)=0,a1=1/2.求证{1/Sn}为等差数列.及求an的表
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 a1=1/2,An=-2SnS(n-1) n>=2 ①求证1
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=2>,a1=1/2,求证1/Sn是等差数列,求通项an的
已知等差数列{an}的前n项和为Sn,且a1不等于0,求(n*an)/Sn的极限、(Sn+Sn+1)/(Sn+Sn-1)
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}首项a1=3通项an与前n项的Sn之间满足2an=SnS(n-1) (n>=2)求证{1/Sn}为等差数列并
已知数列an的前n项和为Sn,且an+2Sn*Sn-1=0,a1=1/2,求证1/SN是等差数列,求数列SN的的通项公式
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) (
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,
已知数列an的各项均为正数,前n项和为Sn,且满足2Sn=an^2+n-4,(1)求证an为等差数列 (2)求an的通项