数列an满足an+1=2an （0≤an＜1/2） 2an-1 （1/2≤an＜1） 若a1=6/7 则a2009的值为

数列{an}满足an+1=2an 0≤an≤1/2 an+1=2an-1 1/2≤an 已知数列an满足a1=1,1/an+1=根号1/an^2+2,an>0,求an 数列{an}满足:a1=1,an>0,an+1^2-an^2=1,那么an 数列{an}满足:a1=1,an>0,an+1^2-an^2=1,那么an 已知数列｛an｝满足a1=1,an+1 -an+2an+1•an=0求通项 数列an满足,a1=8且8an+1an-16an+1+2an+5=0 数列an满足an+1=根号(an^2+1)+an,a1=a>0,求an通项公式 已知数列an满足1/a-an=2根号n,且an>0.求an的通项公式是数列{an}满足1/an-an=2根号n，且an>0，求an的通项公式。 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 数列an满足an+I={2an,O≤an 数列{an}满足a1=1 an+1=2n+1an/an+2n 数列[An]满足An+1-An+3=0,且A1=-5.求An. 数列｛an｝满足a1=1,且an=an-1+3n-2,求an 数列an满足a1=2,an+1=4an+9,则an=? 已知数列{an}满足an+1=2an+3.5^n,a1=6.求an 数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an 数列an满足a1=2,an+1=an²求an 数列an满足a1=2,an+1=an²求an