1, 7, 7, 9, 3,( )
- A7
- B11
- C6
- D1
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
1,7,7,9,3,( )A7 B11 C6 D1
1,3,3,5,7,9,13,15(),()AA:19,21BB:19,23CC:21,23DD:27,30
:O.9,1.1,1.3,1.5,1.7,( )。A1.8B1.9C2.1D2.3
5、1/3, 1/7, 7/9, 1/31, 19/45, (
1/3, 1/7, 7/9, 1/31, 19/45, ( )。A11/21B13/51C63/65D91/165
6、: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