a1=1/2,an+1=an/an+2,求n/an的前n项和sn

数列an中,a1=3,an+1=an/2an+1,则an=? 数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an 数列{an}中,2an*an+1+2an+1-an=0,a1=1,an=? 已知a1=2,an不等于0,且an+1-an=2an+1an,求an 数列｛an｝中,a1=1/2 3an*an-1+an-an-1=0,通项公式an 数列{an}满足a1=1 an+1=2n+1an/an+2n 数列｛an},a1=1,an+1=2an-n^2+3n,求｛an｝. a1=1/2,an+1=an/an+2,求n/an的sn 已知数列｛an｝,a1=1,an+1=2an/an+2,求a5 数列an集合中,a1=2,an+1=an+(2n+1),求an. 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=( ) 设数列{an}中,a1=2,an+1=an+n+1,则通项an=? 已知｛an｝,a1=1,an+1=2/3an+1,求an an+1 ,n+1是下表 ,an+1=an^3 a1=2 ,求an 已知递推公式an+1=(an)^2+2an,a1=2求an 数列{an}中,a1=35,an+1-an=2n-1,求an 已知数列an,a1=1 an+1-an=2的n次幂求an