已知{an}是递增数列,其前n项和为Sn,a1>1,且10Sn=(2an+1)(an+2),n属于N+.
已知数列{An},Sn是其前n项和,且满足3An=2Sn+n,n为正整数,求证数列{An+1/2}为等比数列
已知数列An中,其前n项和为Sn,A1=1,且An+1=2Sn,求An的通项公式和Sn
已知数列an的前n项和为sn,且sn+an=1/2(n2+5n+2)(2属于n*) 计算a1 a2 a3 a4
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的前n项和为Sn,已知A1=1,An+1=Sn*(n+2)/n,证明数列Sn/n是等比数列
已知数列An中,其前n项和为Sn,A1=1,且An+1=2Sn 求数列an的通项公式
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Sn=2an-1(n属于正整数),求数列{an}的通项公式an
已知数列an前n项和为Sn,且满足4(n+1)(Sn+1)=(n+2)^2an(n属于正整数) 求an
已知数列an的前n项和为sn,且a1=1,an+1=1/2sn
已知数列{an}的前n项和为Sn,且a1=1,an+1=1/2Sn.
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