若数列an满足a1=1,a2=2,且an=a（n-1）/a（n-2）,则a2009

若数列{an}满足a1=1,a2=5且an+2=an+1-an,求a2000 已知数列an满足an=1+2+...+n,且1/a1+1/a2+...+1/an 数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an a1+a2+...+ak=a1×a2×...×ak,an+k=k+an(N属于正整数已知各项均为正整数的数列an满足an≤an+1,且存在正整数k,使得a1+a2+...+ak=a1×a2×...×ak,an+k=k+an（N属于正整数）（1）求数列{an}的通项公式；（2）若数列b 已知递增数列{an}满足a1=1,(2an+1)=an+(an+2),且a1,a2,a4成等比数列.求an 已知数列an满足an=1+2+...n,且（1/a1）+(1/a2）+...(1/an) 已知数列{an}满足:a1=1,且an-an-1=2n,求(1)a2,a3,a4.(2)求数列{an}的通项an 若数列{An}中满足a1=1,a2=2,且an=an-1/an-2,则a2013= 若数列an满足 a1=2011,a2=2012,且An+2=(An+1 +1)/An ,求a2012=? 若数列{An}中满足a1=1,a2=2,且an=an-1/an-2,则a2010等于? 【高中数学数列】已知数列an满足a1=1,a2=2,且an=an-1/an-2 (n大于等于3)则a2012=? 已知数列｛an｝满足：a1=1,且an-a（n-1）=2n.求a2,a3,a4.求数列｛an｝通项an 数列an满足a1=2 ,a2=1,且( an-1 -an )/anan-1 =(an -an+1 )/anan+1 (n大于等于2),求a100 = 数列an满足a1=1/2,a1+a2+a3……an=n^2an,则an 数列｛an｝满足a1=1,且an=an-1+3n-2,求an 已知数列{an}满足a1=1,a2=3,an+2=3an+1-2an求an 已知数列{an}满足a1=2且anan+1-2an=0球a2,a3,a4的值 关于数列、等差数列的题目设数列an满足an+1=an-2且a1=241）判断an是什么数列2）若an