网址:http://m.1010jiajiao.com/timu_id_64887[举报]
设数列满足且.
(Ⅰ)求的通项公式;
(Ⅱ)设,记,证明:.
(Ⅱ)令,求数列的前项和.
(Ⅲ)求数列的前项和.
设数列满足且
(Ⅱ)设