共30题用时5分钟
11-5=
9+6=
8+8=
6+6=
7+6=
5+6=
15-9=
14-8=
11-6=
9+4=
12-7=
13-5=
17+1 =
15-8=
5+8=
16+3=
8+4=
( )+5=18
7+5=
9+2=
14+( )=18
12+8 =
15+5=
16-8=
14-7 =
8+6=
( )+8=12
11-6=
14-10 =
( )-8=8