2,3,7,( ),121,721。
- A11
- B17
- C19
- D25
1、12,2,2,3,14,2,7,1,18,3,2,3,40,10,( ),4
12,2,2,3,14,2,7,1,18,3,2,3,40,10,( ),4A4B2C3D1
:2/3,1/2,2/5,1/3,2/7,( )。A1/4 B1/6 C2/11 D2/9
3、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
2,3,7,25,121,( )A256B512C600D721
2,3,7,25,121,()。
6、2/3, 1/2, 2/5, 1/3, 9/7,( ).
2/3, 1/2, 2/5, 1/3, 9/7,( ).A1/4B1/6C2/11D2/9