数列A1=1/3,An+1=An+An²/n²求证An>1/2+1/4n改成An>1/2-1/4n不好意思

数列an中,a1=3,an+1=an/2an+1,则an=? 已知数列{an}满足a1=1 an+1=an/(3an+1) 则球an 数列｛an｝中,a1=1/2 3an*an-1+an-an-1=0,通项公式an 数列an中,a1=3,an+1=3an,则an= ,sn= 在数列an中,a1=1,an=3an-1+2则an= 已知数列{an}中,a1=1/2,an+1+3an=0,an=( ) 已知数列{an}中a1=1,an+1=3an/an +3,求通项公式 数列｛an},a1=1,an+1=2an-n^2+3n,求｛an｝. 数列｛an｝满足a1=1,且an=an-1+3n-2,求an 在数列an中,a1=2 an+1=an+3n则an= 数列[An]满足An+1-An+3=0,且A1=-5.求An. 在数列{an}中,a1=3,An+1=an^2求an. 设数列,a1=3,an+1=3an-2,求数列an是等比数列 数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an 已知数列an满足 a1=1/2,an+1=3an/an+3求证1/an为等差数列已知数列an满足 a1=1/2,an+1=3an/an+3求证1/an为等差数列 已知数列{an},a1=1,an+1=3an/2an+3,(1)求数列{an}的前五项)(2)数列{an}的通项公式 已知数列{An}中,a1=4,an+1+an=6n+3,求证数列an-3n是等比数列,求证数列an的通项an 已知数列{an}满足a1=1,a2=3,an+2=3an+1-2an求an