数列{an}的前n项和Sn=a1+a2+……an,满足log2Sn=n+1/2,则数列{an}是( )
1.Sn是数列{an}的前n项和,log2Sn=n(n=1,2,3,…),那么数列{an}(D)
已知数列an满足a1+2a2+3a3+...+nan=n(n+1)*(n+2),则数列an的前n项和Sn=?
已知数列an满足a1+2a2+3a3+……+nan=n(n+1)(n+2),则它的前n项和Sn=?
在各项为正的数列{an}中,数列的前n项和Sn满足Sn=2分之一(an+an分之一),(1)求a1,a2,a3.
设数列{an}的前n项和为Sn,并且满足2Sn=an²+n,an>0.(1)求a1,a2,a3.(2)猜想{a
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项的和Sn=(1/3)*an-2,求:lim(a1+a2+...+an)
数列an满足sn=3an-1/2 计算a1,a2,a3,a4 猜an通项 求an前n项和sn
设数列{an}的前n项和为Sn,满足2Sn=an+1-2^n+1+1,且a1,a2+5.a3成等差数列
设数列{an}的前n项和为Sn,满足2Sn=an+1-2^n+1+1,且a1,a2+5.a3成等差数
设数列an的前n项和为Sn,满足2Sn=an-2∧n+1 +1 ,且a1,a2+5,a3成等差
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