A、-18 B、-20 C、-26 D、-28
【例题】5,12 ,24,36,52,( ),
A.58 B.62 C.68 D.72
【例题】1,3, 15,( ),
A.46 B.48 C.255 D.256
【例题】3/7,5/8,5/9,8/11,7/11,( )
A.11/14 B.10/13 C.15/17 D.11/12
【例题】1,2,2, 3,3,4,5,5,( )
A.4 B.6 C.5 D.0