玩一把。：-）

　　1) 2, 3/2, 10/9, 7/8, 18/25, ？

　　A.5/14　B. 11/18　C. 13/27　D.26/49
Ans:B

　　2) 2, 4, 6, 9, 13, 19, ？

　　A.28　B.29　C.30　D.31
Ans:A

　　3) -2, 1/2, 4, 2, 16, ？

　　A. 32　B. 64　C. 128　D.256
Ans:D

　　4) 21, 28, 33, 42, 43, 60, ？

　　A. 45　B. 56　C.75　D.92
Ans:C

　　5) 1, 3, 0, 6, 10, 9, ？

　　A.13　B.14　C.15　D.17
Ans:D

所有跟帖： 

• Would you please show your reasoning for 4 and 5? Thanks! -innercool- ♀ (0 bytes) () 09/19/2009 postreply 14:00:54

• 回複：Would you please show your reasoning for 4 and 5? Thanks! -^V^- ♂ (513 bytes) () 09/19/2009 postreply 14:50:52

• 回複：回複：Would you please show your reasoning for 4 and 5? Thanks! -jinhr- ♂ (276 bytes) () 10/04/2009 postreply 20:29:59