已知数列{an}满足a1=6,a2=8,an+1+an-1=an(n≥2),则a2009=
已知数列{an}满足a1=6,a2=8,an+1+an-1=an(n≥2),则a2009=
数列an满足a1=3/2,a(n+1)=an^2-an+1则m=1/a1+1/a2````1/a2009整数部分是
1 在数列an中,已知 a1=1,a2=5,an+2=a(n+1)-an (n∈N)则a2009是多少
已知数列{an}满足a1=1,a2=-13,an+2-2an+1+an=2n-6
已知数列{an}满足a1=1,a2=-13,an+2-2an+1+an=2n-6
已知数列an满足an=1+2+...+n,且1/a1+1/a2+...+1/an
已知数列{an}中,a1=3,a2=6,a(n+2)=a(n-1)-an,则a2009=
已知数列{an}满足a1=1,a2=2,an+2=an+an+12,n∈N*.
一直数列{An}满足A1=1/2,A1+A2+…+An=n^2An
已知数列{an}满足a1=1,a2=2,an+2=(an+an+1)/2,n∈N*.令bn=an+1-an,证明{bn}
数列an中已知a1=1,a2=5,a(n+2)=a(n+1)-an,则a2009等于
已知数列{an},an=2^n,则1/a1+1/a2+...+1/an等于多少?