设数列{an}满足a(n+1)=an2-nan+1,n=1,2,3,…当a1=2时,求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……
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满足a1+2a2+3a3+...+nan=(n+1)(n+2) 求通项an
设数列{an}满足:an+1=an^2-nan+1,n=1,2,3,…当a1≥3时,证明对所有的n≥1,有(1)an≥n
已知数列(an)满足a1+2a2+3a3+...+nan=n(n+1)(n+2)求an
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
设数列an满足a1=1/2,2nan+1=(n+1)an,求数列an的通项公式
设数列{an}满足a1=,an+1-an=3*2的2n-1 求数列{an通项公式 令bn=nan.求数列{bn}的前n项
若数列{an}满足a1+2a2+3a3+~~+nan=n(n+1)(2n+1),则an=
设数列{an}满足a1+3 a2+3^2 a3+……+3^n-1 an=n/3,a属于N* 求数列{an}的通项
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