A . 11/21
B . 13/51
C . 63/65
D . 91/165
[主观题]-1/7,1/7,1/8,-1/4,-1/9,1/3,1/10,()A.-2/5;B.2/5;C.1/12;D.5/8;
[单选题]-1/7,1/7,1/8,-1/4,-1/9,1/3,1/10,()A . -2/5B . 2/5C . 1/12D . 5/8
[试题]2/3,1/2,3/7,7/18,()A.5/9;B.4/11;C.3/13;D.2/5
[单选题]2/3,1/2,3/7,7/18,()A .4/11B .5/12C .7/15D .3/16
[主观题]2/3,1/2,3/7,7/18,()A、4/11;B、5/12;C、7/15;D、3/16
[主观题]20/9,4/3,7/9,4/9,1/4,()A、3/7;B、5/12;C、5/36;D、7/36
[单选题]:1,2/3,5/9,1/2,7/15,4/9,( )。A.5/9B.3/5C.2/13D.3/7
[单选题]1/3,1/2,7/10,19/20,( )。A.19/30B.43/40C.77/60D.59/50
[单选题]1/3,1/2,7/10,19/20,( )。A.19/30B.43/40C.77/60D.59/50
[单选题]1/3,1/2,7/10,19/20,( )。A.19/30B.43/40C.77/60D.59/50