15
10
7
( )?
15-7=
13-5=
8+4=
7+6=
18-9=
19-8=
5+9=
4+10=
15-5=
16-10=
10+5=
11-6=
89100 15-911-2
4545 17-812-4
11-=7 15-=4 +2=11
-9=5 -8=7 7+=16
12-7=
14-6=
3+10=
11-4=
16-7=
9+6=
8+7=
15-9=
15+4=
14-7=