【简答题】在数列{a n }中,若a 1 ,a 2 是,且a n =|a n-1 -a n-2 |,n=3,4,5,…,则称{a n }为“绝对差数列”, (Ⅰ)举出一个前五项不为零的“绝对差数列”(只要求写出前十项); (Ⅱ)若“绝对差数列”{a n }中,a 20 =3,a 21 =0,数列{b n }满足b n =a n +a n+1 +a n+2 ,n=1,2,3,…,分别判断当n→∞时,a ...
【简答题】如果输入4,6.8,1,9.7, -2 ,则下列程序的输出结果是() number = eval (input()) max = number while number > 0: number = eval (input()) if number > max: max = number print (max)
【简答题】已知公比为q(0<q<1)的无穷等比数列{a n }各项的和为9,无穷等比数列{a n 2 }各项的和为 , (Ⅰ)求数列{a n }的首项a 1 和公比q; (Ⅱ)对给定的k(k=1,2,3,…,n),设T (k) 是首项为a k ,公差为2a k -1的等差数列。求数列T (2) 的前10项之和; (Ⅲ)设b i 为数列T (i) 的第i项,S n =b 1 +b 2 +…+b n ,求S n...
【简答题】在数列{a n }中,若a 1 ,a 2 是,且a n =|a n-1 -a n-2 |,n=3,4,5,…,则称{a n }为“绝对差数列”. (Ⅰ)举出一个前五项不为零的“绝对差数列”(只要求写出前十项); (Ⅱ)若“绝对差数列”{a n }中,a 20 =3,a 21 =0,数列{b n }满足b n =a n +a n+1 +a n+2 ,n=1,2,3,…,分别判断当n→∞时,a ...