1.已知數(shù)列{a
n}是公比q>1的等比數(shù)列,前三項(xiàng)和為13,且a
1,a
2+2,a
3恰好分別是等差數(shù)列{b
n}的第一項(xiàng),第三項(xiàng),第五項(xiàng).
(Ⅰ)求數(shù)列{a
n}和{b
n}通項(xiàng)公式;
(Ⅱ)設(shè)數(shù)列{c
n}的通項(xiàng)公式c
n=
(n∈N
*),求數(shù)列{c
n}的前2n+1項(xiàng)和S
2n+1;
(Ⅲ)求
(n∈N
*).