12-4-3=
14-5-2=
18-9-9=
11-2-3=
15-5-2=
13-9-1=
18-4-7=
19-3-8=
17-8-5=
11-3-4=
14-7-3=
15-6-3=
18-6-4=
9-5-3=
17-4-5=
8+8=
8+6=
15-9=
13-8=
15-10=
19-8=
14+3=
8+9=
3+8=
18-9=
4+7=
13-9=
16-7=
10+8=
5+8=
14-8=
6+7=
3+9=
12-8=
16-8=
8+7=
18-10=
15-8=
7+9=
11-8=
2+9=
17-9=
8+5=
15+5=
13﹣9=
5+9=
6+8=
14﹣6=
15﹣7=
17﹣8=
7+4=
14-8= 13-8= 12-8=
8+=14 8+=13 8+=12
8+<13 17->9 3<10-。