已知数列{an}共有2k项(整数k≥2),数列{an}的前n项的和为Sn,满足a1=2,an+1=(a-1)Sn+2(n
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,且满足sn=n²an-n²(n-1),a1=1/2
已知数列{an}的前n项和为Sn,a1=-23,Sn+1Sn=an-2(n≥2,n∈N)
已知数列{an}满足ak+a(n-k)=2,(k,n-k∈N*),则数列{an}的前n项和Sn=
有穷数列{an}共有2k项,a1=2,设数列前n项和为Sn,且an+1=(a-1)Sn+2,a>1,求证:数列{an}是
已知数列{an}的前n项和为Sn,且满足a1=1,Sn-Sn-1=2SnSn-1(n≥2).
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}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满足;a1=1,an+1-an=1,数列bn的前n项和为sn,且sn+bn=2
已知数列{an}的前n项和为Sn,且满足a1=1,2an/(anSn-Sn^2)=1(n大于等于2)
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Sn=-an-1/2^n-1+2(n为整数)