[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]1,1,3,3,7,5,13,7,21,( )。A.9B.11C.8D.22
[主观题]比较。5/13和8/135/7和5/114/5和7/82/9和1/6
[主观题]填空。1/3+7/13=()5/7-2/7=()()-1/12=11/127/5-()=3/5
[单选题]第 31 题 11/3 , 7/3 , 1, , -5/3A.7/3B.-1/3C.5/3D.4/3
[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]1/3,4/7,7/11,2/3,13/19,( )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, 3, 3, 5, 7, 9, 13, 15, ( ), ( )。A.19,21B.19,23C.2l,23D.27,30