Ответ:
13 + 3 = 16; 18 − 10 = 8; 17 + 2 = 19.
14 + 1 = 15; 20 − 1 = 19; 19 − 4 = 15.
15 − 5 = 10; 6 + 10 = 16; 10 + 10 = 20.
5 + 6 = 11; 7 + 8 = 15; 9 + 2 = 11.
6 + 6 = 12; 9 + 5 = 14; 8 + 9 = 17.
6 + 7 = 13; 7 + 4 = 11; 6 + 9 = 15.
11 − 4 = 7; 12 − 5 = 7; 13 − 6 = 7.
12 − 3 = 9; 13 − 4 = 9; 14 − 5 = 9.
13 − 5 = 8; 14 − 6 = 8; 15 − 7 = 8.
