A.9
B.11
C.8
D.22
[主观题]填空。1/3+7/13=()5/7-2/7=()()-1/12=11/127/5-()=3/5
[单选题]:1, 3, 3, 5, 7, 9, 13, 15, ( ), ( )。A.19,21B.19,23C.2l,23D.27,30
计算:(1)/(3)×(3)/(5)+1(5)/(7)-(5)/(9)×(5)/(7)1-(5)/(7)×(21)/(25)(1)/(2)+(5)/(4)×(4
[单选题]-27,-7,1,3,5,13,( )A.33B.31C.27D.25
[单选题]:1,3,3,5,7,9,13,15,( ),( )。A.19,21 B.19,23 C.21,23 D.27,30
[单选题]1,3,3,5,7,9,13,15(),()A . A:19,21B . B:19,23C . C:21,23D . D:27,30
[试题]1,3,3,5,7,9,13,15(),()A:19,21;B:19,23;C:21,23;D:27,30;
[单选题]3, 5, 7, 9, 13, 15, 21, 23, ( )。A.29B.31C.33D.35
[主观题]填空。2/7=()/219/12=3/()5÷3=()/()=1又()/()
[单选题]1/3,4/7 ,7/11 ,2/3 ,13/19 ,( )A. 16/21B. 16/23C. 18/21D. 17/21