A.15
B.17
C.20
D.23
[主观题]2/3,1/2,3/7,7/18,()A、4/11;B、5/12;C、7/15;D、3/16
[单选题]5,8,( ),23,35。A.19B.18C.15D.14
[单选题]1/4,2/7,2/5,8/13,1( )A.9/16B.3C.32/19D.28/17
[单选题]:1,1,2,5/2,3(2/5),()。A.5(4/5) B.5(1/5) C. 4(13/15) D. 4(5/17)
[单选题]1,1,2,5/2,3(2/5),()。A. 54/5 B. 51/5 C. 41/315 D. 4(5/17)
[单选题]1,1,2,5/2,3(2/5),()。A.5(4/5) B.5(1/5) C. 4(13/15) D. 4(5/17)
[单选题]1/2,3/2 ,11/8 ,21/32 ,( )A. 7/64B. 25/64C.12/31D. 13/64
[单选题]1,2,3/2,8/5,5/3,12/7,( )A.10/7B.11/7C.14/8D.13/8
[单选题]5,8,-4,9,( ),30,18,21。A.14B.17C.20D.26
[单选题]5,8,-4,9,( ),30,18,21。A.14B.17C.20D.26