已知数列{an}的前n项和Sn满足:Sn+Sm=Sn+m,且a1=1.那么a10=___.
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a1=1,Sn-Sn-1=2SnSn-1(n≥2).
已知数列的前n项和为Sn,且an=Sn·Sn-1(n>=2),a1=2/9,则a10=
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}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}的首项a1=5,前n项和为Sn,且Sn+1=2Sn+n+5(n∈N*).
已知数列{an}的首项是a1=1,前n项和为Sn,且Sn+1=2Sn+3n+1(n∈N*).
已知数列{an}的前n项和为Sn,且满足an+2Sn*Sn-1=0,a1=1/2.
已知数列{an}的前项和为sn,且满足sn=sn-12sn-1+1(n≥2),a1=2.
数列an的前n项和为Sn.且满足a1=1.2Sn=(n+1)an
已知Sn是数列{an}的前n项和,且a1=2,当n≥2时有 Sn=3Sn-1+2.