已知数列{an}的前项和为sn,且满足sn=sn-12sn-1+1(n≥2),a1=2.
已知数列{an}的前项和为sn,且满足sn=sn-12sn-1+1(n≥2),a1=2.
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{an}的前项和为sn,a1=2/9且an=sn*sn-1(n>=2),则a10等于
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}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}的前项和为sn,且sn+1=4an+2(n∈N+),a1=1,.
已知数列{an}的首相a1=1,a2=3,前n项和为Sn,且Sn+1(下标)、Sn、Sn-1(下标)(n≥2)满足(Sn
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
已知数列{an}中的前几项和为Sn且满足a1=0.5,an=-2Sn*S(n-1).证明数列{1/Sn}为等差数列,求S