-
:18,3,16,1,17,2,19,()。A.5 B.4 C.3 D.2
-
5,10,(),34,65,130 A.15 B.16 C.17 D.18
-
2, 3, 5, 7, 12, 15, (), () A.26,31 B.17,21 C.27,31 D.16,21
-
1, 2, 5, 3, 7, 8, 10, 15, ()A.16 B.17 C.18 D.I9
-
2,3,5,7,11,13,(),19,… A.15 B.16 C.17 D.18
-
5, 10, (), 34, 65, 130A.15 B.16 C.17 D.18
-
1/3,2/5,4/9,(),16/23,32/33A.6/13B.8/15C.10/17D.12/19