A . -2/5
B . 2/5
C . 1/12
D . 5/8
[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]2/3,1/4,2/5,(),2/7,1/16,A.1/5;B.1/17;c.1/22;d.1/9
[单选题]2/3,1/4,2/5,(),2/7,1/16,A.1/5;B.1/17;C.1/22;D.1/9;
[单选题]1/3,1/7,7/9,1/31.19/45,()A . 11/21B . 13/51C . 63/65D . 91/165
[单选题]1/5,1/3,3/7,1/2,( )A.5/9B.1/6C.6D.3/5
[单选题]:3/15,1/3,3/7,1/2,()。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.5/8B.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]:1,2/3,5/9,1/2,7/15,4/9,( )。A.5/9B.3/5C.2/13D.3/7