若数列{an}满足a1=1,a2=2且a(n+1)=an/a(n-1)(n≥2),则a2011的值

已知数列an满足an=1+2+...+n,且1/a1+1/a2+...+1/an 若数列{an}满足a1=1,a2=5且an+2=an+1-an,求a2000 若数列{an}满足a1=1,且1/[a(n+1)]-1/an=1,则a1*a2+a2*a3+…+a2010*a2011=? 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 已知正项数列｛a｝满足a1=1/2,且a(n+1)=an/(1+an) 1,求正项数列｛a｝的通项公式 2,求和:a1/1+a2/2+.2,求和:a1/1 + a2/2 +......+an/n 若数列{an}满足a1=1,a2=2且a(n+1)=an/a(n-1)(n≥2),则a2011的值 若数列an满足a1=1,a2=2,且an=a（n-1）/a（n-2）,则a2009 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 数列{an}满足a(n+2)an=2a(n+1),且a1=1,a2=2,则数列的前2011项乘积为 已知数列an满足an=1+2+...n,且（1/a1）+(1/a2）+...(1/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}满足:a1=1,a2=2,且a(n+2)=(2+cosnπ)(an-1)+3.n∈N*1求通项公式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? 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:a1=1,且an-an-1=2n,求(1)a2,a3,a4.(2)求数列{an}的通项an