A.5/6
B.11/14
C.6/7
D.13/15
[单选题]:2/5,5/8,8/11,( )A.5/6B.11/14C.6/7D.13/15
[单选题]2/3,3/5,5/8,9/13,()A.2/3B.5/7C.16/21D.17/22
[单选题]1,2,3/2,8/5,5/3,12/7,( )A.10/7B.11/7C.14/8D.13/8
[主观题]( 8,8 ) 10分
[主观题]比较。5/13和8/135/7和5/114/5和7/82/9和1/6
[单选题]8,8, 12, 24, 60, ( )。A.90B.120C.180D.240
[主观题]3/7,5/8,5/9,8/11,7/11,()A.11/14;B.10/13;C.15/17;D.11/12;
[单选题]3/7,5/8,5/9,8/11,7/11,()A . 11/14B . 10/13C . 15/17D . 11/12
[单选题]2/3,5/7,8/11,11/15,( )A.14/19B.7/9C.13/21D.1
[单选题]0,1/2,8/11,5/6,8/9,()A.31/34 B.33/36 C.35/38 D.37/40