16 + 11 =
4 . 1 =
2 - 1 =
11 + 12 =
8 + 18 =
2 : 1 =
8 : 8 =
21 + 6 =
9 : 3 =
11 : 11 =
17 + 12 =
0 : 993 =
5 - 0 =
11 . 0 =
22 + 4 =
27 - 17 =
1 + 28 =
30 - 18 =
20 - 19 =
15 + 13 =