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