1,1,3,4,7,( )
- A7
- B8
- C9
- D10
1,1,3,4,7,( )
新数列的奇数项:0、1、2 为等差数列;新数列的偶数项:2、3 为等差数列。故正确答案为C。
1、-1/7,1/7,1/8,-1/4,-1/9,1/3,1/10,()
-1/7,1/7,1/8,-1/4,-1/9,1/3,1/10,()A-2/5B2/5C1/12D5/8
2、1/4 ,3/4,1,7/6,31/24,167/120, ( )
1/4 ,3/4,1,7/6,31/24,167/120, ( )A59/40B271/180C1087/720D1337/960
3、:1,2/3,5/9,1/2,7/15,4/9,( )。
:1,2/3,5/9,1/2,7/15,4/9,( )。A5/9B3/5C2/13D3/7
:1,4,3,5,2,6,4,7,( )。A1 B2 C3 D4
5、50个数1,2,3,2,3,4,3,4,5,4,5,6,5,6,7,6,7,
50个数1,2,3,2,3,4,3,4,5,4,5,6,5,6,7,6,7,8,......的和是:A568B497C532D491
1,1,3,4,9,7,( )A11B5C27D10