A.19.18
B.19,15
C.21,15
D.27,18
[单选题]:1, 3, 3, 5, 7, 9, 13, 15, ( ), ( )。A.19,21B.19,23C.2l,23D.27,30
[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
[主观题]填空。1/3+7/13=()5/7-2/7=()()-1/12=11/127/5-()=3/5
[试题]1,3,3,6,7,12,15,()A.17;B.27;C.30;D.24;
[单选题]1,3,3,6,7,12,15,()A .17B .27C .30D .24
[主观题]计算。7/8-5/6=2/9+1/2=6/7-2/3=3/10+1/4=3/7+1/9=1/3-1/5=1/6+1/4=5/7-1/5=
[单选题]13, 9, 11, 6, 9, 3,______,______ ( )A.6,0B.-1,1C.7,0D.7,6
[主观题]计算。3/7+4/5=5/12+5/8=7/9+6/7=1-2/7-3/7=1/4+1/6+3/4=1/2-1/6=
[主观题]填空。2/7=()/219/12=3/()5÷3=()/()=1又()/()