28. a 9 5 2 6 4 b 6 3 9 8 9 a·b k 16 12 18 24 42 c 2 4 3 6 6 k:c

1. a * b

9 * 6 = 54

5 * 3 = 15

2 * 9 = 18

6 * 8 = 48

4 * 9 = 36

2. k : c

16 : 2 = 8

12 : 4 = 3

18 : 3 = 6

24 : 6 = 4

42 : 6 = 7

Ответ: 54; 15; 18; 48; 36; 8; 3; 6; 4; 7.