15 : 1 =
28 + 1 =
4 - 4 =
8 . 1 =
29 - 3 =
16 : 4 =
13 + 14 =
0 : 709 =
22 . 1 =
18 - 6 =
30 . 1 =
18 . 1 =
6 - 4 =
4 : 2 =
9 . 3 =
4 . 3 =
23 . 0 =
14 + 5 =
8 : 2 =
7 - 3 =