5/12+1/12= 14/15-4/15=
3/7-3/7= 3/8+3/8=
3/10+1/10= 5/8-1/8=
[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
[单选题]2,5,1,12,3,2,2,14,2,1,7,36,4,( ),3A.1B.2C.3D.4
[单选题]0,-3,( ),5,20,4,12,15。A.10B.-11C.12D.-13
[单选题]0,-3,( ),5,20,4,12,15。A.10B.-11C.12D.-13
[单选题]0,-3,( ),5,20,4,12,15。A.10B.-11C.12D.-13
[单选题]3,15,7,12,11,9,15,( )。A.6B.8C.18D.19
[单选题]:3,15,7,12,11,9,15,( )。A.6 B.8 C.18 D.19
[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]计算。4/3-(2/5+3/10)5/7+1/4-9/143/4+3/6-5/8