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