Ответ:

Для 6 × 8:

6 × 8 = 48
8 × 6 = 48
48 : 6 = 8
48 : 8 = 6

Для 9 × 3:

9 × 3 = 27
3 × 9 = 27
27 : 9 = 3
27 : 3 = 9

Для 7 × 4:

7 × 4 = 28
4 × 7 = 28
28 : 7 = 4
28 : 4 = 7