已知数列a1=2,nan+1(n+1是下标)=(n+1)an+2n(n+1),求an.
已知数列(an)满足a1+2a2+3a3+...+nan=n(n+1)(n+2)求an
数列{an},a1=2,an+1(下标)=an下标+n+1 求通项an下标
数列an的前n项和Sn,a1=1,a(n+1)(下标)=2Sn.求通项an 求nan的前n项和Tn
高中数学已知数列A1=1,nAn+1=(n+2)An+n.求An=?.An+1是第n+1项
已知an+1=(4an+3)/(an+2),a1=2,求数列{an}的通项公式(其中n+1,n是下标)
数列{an}的前n项和为Sn,a1=1,an+1(n+1是下标)=2Sn+1,求数列{nan}的前n项和为Tn
已知数列{an}中a1=-1且(n+1)an,(n+2)an+1(是下标)成等差数列,设bn=(n+1)an-n+2求证
已知数列{an(n下标)}满足a1(1下标)=1,a2(2下标)=3,.求证:bn(n下标)是等差数列.
已知数列an中 a1=-2且an+1=sn(n+1为下标),求an,sn
已知在数列{an}中,a1=2,an=3a[(n-1)](下标)-2,求an
设数列{an}满足a1+2a2+3a3+.+nan=n(n+1)(n+2)
已知数列{an}中a1=1,an+1(下标是n+1)=an+2an/an+2(下标是n).求这个数列的通项公式