Решение:
2 × 7 = 14
5 × 6 = 30
18 : 2 = 9
21 : 3 = 7
6 × 3 + 45 = 18 + 45 = 63
52 - (6 × 4) = 52 - 24 = 28
Ответ: 14, 30, 9, 7, 63, 28