:3,4,7,16,()
A.23
B.27
C.39
D.43
:3,4,7,16,43,()。A.62 B.63 C.124 D.126
1/3,4/7 ,7/11 ,2/3 ,13/19 ,()A. 16/21 B. 16/23 C. 18/21 D. 17/21
3,4,7,16,() A.23 B.27 C.39 D.43
3,4,7,16,43,()。A.62 B.63 C.124 D.126
3,4,7,16,() A.23B.27C.39D.43
2,4,3,(),13/4,27/8,53/16。A.1 B.7/2 C.7/3 D.4