Question

填空并写出数列的通项公式1,3,7,,31,,127;2,5,,17,26,,50;1/2,-1/4,,-1/16,1/

Answer 1

15 63 2·2^(n-1)-1

10 37 n²+1

1/8 -1/64 (-1)^(n+1)1/(2^n)

√3 √6 √n

以上n=1,2,3,.