A.121/81 B.67/81 C.121/51 D.67/51
[单选题]:1,4/3,13/9,40/27,()。A.121/81 B.67/81 C.121/51 D.67/51
[主观题]1/3,3/9,2/3,13/21,()A.17/27;B.17/26;C.19/27;D.19/28;
[单选题]1/3,3/9,2/3,13/21,()A .17/27B .17/26C .19/27D .19/28
[单选题]1/3,4/7,7/11,2/3,13/19,( )A.16/21B.16/23C.18/21D.17/21
[单选题]1/3,4/7,7/11,2/3,13/19,()A.16/21B.16/23C.18/21D.17/21
[单选题]1, 1, 5, 3, 9, 9, 13, 27, ( ), ( )。
[主观题]1,1,5,3,9,9,13,27,(),()A.17,81B.16,54C.15,36D.14,42
[单选题]1,4,l,5,9,( ),6A.3B.2C.1D.8
[单选题]2,1,4,3,8,9,( ),27。A.12B.14C.16D.18
[单选题]9, 1, 4, 3,40, ( )。A.80B.81C.121D.120