A.5/8
B.4/9
C.15/27
D.-3
[试题]3/15,1/3,3/7,1/2,()A.5/8B.4/9C.15/27D.-3
[单选题]:3/15,1/3,3/7,1/2,()。A.5/8 B.4/9 C.15/27 D.-3
[单选题]3/15,1/3,3/7,1/2,()。A.5/8 B.4/9 C.15/27 D.-3
[单选题]1/5,1/3,3/7,1/2,( )A.5/9B.1/6C.6D.3/5
[单选题]2/15,1/5,1/3,(),13/15,7/5,34/15。A. 25 B. 815 C. 35 D. 23
[单选题]1/2,1,2/3,3/4,5/7,()A.7/11B.8/11C.7/13D.8/13
[单选题]1/3,1/15,1/35,( )。A.1/65B.1/75C.1/125D.1/63
[主观题]3,2,5/3,3/2,()A、1/2;B、1/4;C、5/7;D、7/3
[试题]3,2,5/3,3/2,()A、1/2;B、7/5;C、1/4;D、7/3
[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;