如题~设数列前n项和sn……a1+2a2+3a3+……+nan=(n―1)sn+2n……求an通项公式
如题~设数列前n项和sn……a1+2a2+3a3+……+nan=(n―1)sn+2n……求an通项公式
设数列{an}的前n项和为sn,已知a1+2a2+3a3+…+nan=(n-1)Sn+2n(n∈N*)
设数列an的前n项和为Sn 已知a1+2a2+3a3+……+nan=(n-1)Sn+2n
已知数列{an}的前n项和为Sn,且a1+2a2+3a3+…+nan=(n-1)Sn+2n(n∈N*),求数列{an}通
已知数列an满足a1+2a2+3a3+……+nan=n(n+1)(n+2),则它的前n项和Sn=?
设数列{an}的前n项和为Sn,已知a1+2a2+3a3+…+nan=(n-1)Sn+2n (n∈N*).
已知数列{an}的前n项和为Sn,且 a1+2a2+3a3+…+nan=(n-1)Sn+2n(n∈N*).
已知数列{An}前n项和为Sn,且满足Sn=1-nAn(n=1,2,3…),求a1,a2得值.求An通项公式,要详解谢
设数列{an}的前n项和为Sn,a1+2a2+3a3.+nan=(n-1)Sn+2n,
设数列an满足a1+2a2+3a3+.+nan=2^n 1求数列a的通项 2设bn=n^2an 求数列的前n项和Sn求大
已知数列{an}满足a1+2a2+3a3+…+nan=n(n+1)(n+2),则它的前n项和Sn=______.
设数列{an}的前n项和Sn=n^2-4n+1,则/a1/+/a2/+/a3/+……+/a10/=