设an=1/根号n+1+根号n,求a1+a2+a3+……+n48
设an=根号n+根号(n+1),求Sn=a1+a2+a3+...+an
an=1/[根号下(n+1)+根号下(n)],则a1+a2+a3+.+a10=
在数列an中 a1=1 a(n+1)乘根号下an=8 1求a2 a3 2 设bn=lo
设数列{an}满足a1+3 a2+3^2 a3+……+3^n-1 an=n/3,a属于N* 求数列{an}的通项
设a1,a2,a3,…,an(n∈N*)都是正数,且a1a2a3•…an=1,试用数学归纳法证明:a1+a2+a3+…+
已知数列{an}满足A1=0,A(N+1)=AN减去根号三/根号三AN加1.求A2,A3,A4,A5,A6
设数列{an}满足a1=2,a(n+1)=an+1/an(1)求a2,a3,a4(2)比较an与根号(2n+1)的大小,
设数列an满足a1+3a2+3²a3……+3n-1次方an=n/3
设数列{An}满足A1+3A2+3²A3+…+3n-1An=3/n.(1)求数列{An}的通项.
设数列an满足a1+3a2+3²a3+…+3^n-1(an)=n/3,求数列an的通项公式
设A1,A2,A3…,An是常数(n是大于1的整数,且A1
设a1=1,an+1=根号{(an)^2−2an+2+b}(n∈N*)(Ⅰ)若b=1,求a2,a3及数列{a