已知数列(an)满足a1>0,(an+1)/an=1/2（n为正整数）,则数列｛an｝是____数列（递增或递减

已知数列an满足a1=1,1/an+1=根号1/an^2+2,an>0,求an 已知数列｛an｝满足a1=1,an+1 -an+2an+1•an=0求通项 已知数列{an}满足a1=1 an+1=an/(3an+1) 则球an 已知数列an满足a1=1/2,(an+1-1)(an-1)-an+1+an=0求数列an的通项公式 已知数列an满足a1=0,an+1=an-根号3/根号3an+1,则a2012= 已知数列an满足a1=0 a2=1 an=(An-1+An-2)/2 求liman 已知数列an满足a1=0 a2=1 an=(An-1+An-2)/2 求liman 已知数列{an}满足,an+2=an+1-an,且a10=-1,a9=0,求a1 已知数列{an}满足an+1=an+n,a1等于1,则an=? 已知数列{an}满足an+1=2an+3.5^n,a1=6.求an 已知数列满足a1=1/2,an+1=2an/(an+1),求a1,a2已知数列满足a1=1/2,a(n+1)=2an/(an+1),求a1,a2;证明0 已知数列{an}中满足(An+1-An)(An+1+An)=16,且a1=1,an 关于数列极限的已知数列an满足a1=0 a2=1 an=(an-1+an-2)/2 求lim(n->无穷）an 已知数列(an)满足a1>0,(an+1)/an=1/2（n为正整数）,则数列｛an｝是____数列（递增或递减 已知数列{an}中a1=1,且满足an+an-1不等于0,Sn=1/6*(an+1)(an+2).(1)求通项an,并说明{an}是什么数列(2)求数列{an}的前n项和Sn 数列[An]满足An+1-An+3=0,且A1=-5.求An. 已知数列{An}满足：A1=0An+1=An+2n则A2011的值为? 已知数列an满足an=1+2+...+n,且1/a1+1/a2+...+1/an