To many who read Fog, I Am the People, the Mob, Grass, and the 21 sections of Good Morning, America, ___ was successor to 19th century poet Walt Whitman as the proclaimer of the American spirit.
【简答题】设等比数列{a n }的前n项和为S n ,已知 a n+1 =2 S n +2(n∈ N * ) . (1)求数列{a n }的通项公式; (2)在a n 与a n+1 之间插入n个数,使这n+2个数组成公差为d n 的等差数列(如:在a 1 与a 2 之间插入1个数构成第一个等差数列,其公差为d 1 ;在a 2 与a 3 之间插入2个数构成第二个等差数列,其公差为d 2 ,…以此类推),设第n...