The user has provided a set of mathematical expressions and likely expects them to be solved or evaluated. The expressions are presented in columns.

Решение:

1. \( 9.4 \)
2. \( 32:4 = 8 \)
3. \( 20:4 = 5 \)
4. \( 8.4 \)
5. \( 14:7 = 2 \)
6. \( 36:9 = 4 \)
7. \( 7.4 \)
8. \( 24:6 = 4 \)
9. \( 28:4 = 7 \)
10. \( 42 + (20-8) = 42 + 12 = 54 \)
11. \( 50 - (17-9) = 50 - 8 = 42 \)
12. \( 70 - (38+7) = 70 - 45 = 25 \)

Ответ: 9.4; 8; 5; 8.4; 2; 4; 7.4; 4; 7; 54; 42; 25.