5.

Решение:

1. \( 9 \cdot 5 = 45 \)
2. \( 4 \cdot 9 = 36 \)
3. \( 6 \cdot 7 = 42 \)
4. \( 56 : 8 = 7 \)
5. \( 54 : 9 = 6 \)
6. \( 49 : 7 = 7 \)
7. \( 42 : 6 = 7 \)
8. \( 32 : 8 = 4 \)
9. \( 27 : 3 = 9 \)
10. \( 8 \cdot (20 - 14) = 8 \cdot 6 = 48 \)
11. \( (36 + 12) : 6 = 48 : 6 = 8 \)
12. \( (90 - 42) : 8 = 48 : 8 = 6 \)

Ответ: 45, 36, 42, 7, 6, 7, 7, 4, 9, 48, 8, 6.