社数列AN为公差为2,A1=1,前N项和为SN.证2/S1S3+3/S2S4+...+N+1/SNSN+2
已知数列an的前n项和为Sn,且满足an+SnSn-1=0(n>=2,n∈N*),a1=1/2.
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,Sn-1+2SnSn-1=0(N大于等于2),a1=1/2.
已知数列an的前n项和为sn且满足a1=1,sn-sn-1=2snsn-1拜托各位大神
已知数列{an}的前n项和为Sn,且满足a1=1/2,an+2SnSn-1=0(n>=2)
已知数列an的前n项和为Sn,且满足a1=1/2,An=-2SnSn-1 n>=2
已知数列{an}的前n项和为Sn,且满足a1=1/2,an=-SnSn-1(n>=2)
已知数列{an}的前n项和为Sn,且满足a1=12,an+2SnSn-1=0(n≥2).
已知数列{an}的前n项和为Sn.且满足a1=12,an=−2SnSn−1(n≥2)
已知数列an的前n项和为Sn,a1=1,数列{an+Sn}是公差为2的等差数列
已知数列{an}的前n项和为sn,a1=1,数列{an+sn}是公差为2的等差数列
数列前n项和为sn,a1=1,an+sn是公差为2的等差数列,求an-2是等比数列,并求sn