数列﹛an﹜满足an+1-an=-anan+1,若a1=1,则a5等于

已知数列{an}满足anan-1=an-1+(-1)n次方(n≥2),且a1=1,则a5/a3= 已知数列an满足条件a1=-2 an+1=2an+1则a5 如果数列｛an}满足a1=2,a2=1,且（an-1-an)／(anan-1)=(an-an+1)／(anan+1)(n 数列{an}满足a1=1,a2=2,2an+1=an+an+2,若bn=1/anan+1,则数列{bn}的前五项和等于 已知数列{an}满足an+1=an+n,a1等于1,则an=? 已知数列An 满足A1=1,且4An+1-AnAn+1+2An=9 已知数列满足a1=1,根号an-1-根号an=根号anan-1,求an 已知数列{an}满足a1=1,an+1=2an+1（n∈N*）． 若函数bn=anan+1,求数列 若数列{An}满足An+1=An^2,则称数列{An}为“平方递推数列”,已知数列{an}中,a1=9,点（an,an+ 已知数列{an}满足a1=2,an+1=2an/an+2,则an等于多少 已知数列{an}中,a1=2,anan+1+an+1=2an 已知数列an满足a1=1/2,anan-1=an-1-an,求数列an的通项公式