已知数列{an}满足,an+2=an+1-an,且a10=-1,a9=0,求a1
已知各项均为正数的数列{an}中满足,a1=a3,a2=1,an+2=1/1+an则a9+a10=多少?
数列{an}满足a1=1,且an=an-1+3n-2,求an
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an+1=2an+3.5^n,a1=6.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
已知数列{an}满足An+1=2^nAn,且A1=1,则通项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:an+1-2an=2^n+1,且a1=2 (1)证明{an/2^n}是等差数列 (2)求数列an的
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=1/2 sn=n平方×an 求an
已知数列{an},满足a1=1/2,Sn=n²×an,求an
已知数列{an}满足a1=1/2,an+1=3an+1,求数列{an}通项公式