已知数列{An}满足:a1=3/2,且an=3nAn-1/(2An-1+n-1)(n≥2,n∈N*),证明:对一切正整数
设数列{An}满足An+1=An^2-nAn+1,n为正整数,当A1>=3时,证明对所有的n>=1,有
数列an=3^n - 2^n 证明:对一切正整数n 有1/a1 + 1/a2 +…+ 1/an
已知数列{an}满足:a1+2a2+3a3+...+nan=(2n-1)*3^n(n属于正整数)求数列{an}得通项公式
已知数列(an)满足a1+2a2+3a3+...+nan=n(n+1)(n+2)求an
数列an满足a1+2a2+3a3+...+nan=(n+1)(n+2) 求通项an
设数列{an}满足a1+2a2+3a3+.+nan=n(n+1)(n+2)
高二数列题:设数列{an}满足an+1=an^2-nan+1,n为正整数,当a1>=3时,证明……
对任意正整数n,数列an均满足a1+2a2+3a3+……+nan=n(n+1)(n+2)
已知数列{an}满足a1=3,且an+1-3an=3n,(n∈N*),数列{bn}满足bn=3-nan.
已知数列{an}满足:a1=3,an+1=(3an-2)/an ,n∈N*.(Ⅰ)证明数列{(an-1)/an-2
若数列{an}满足a1+2a2+3a3+~~+nan=n(n+1)(2n+1),则an=
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=?