Решение:
1. \( (84 : 6 + 18) + 23 · 6 - 120 : 5 \)
- \( 84 : 6 = 14 \)
- \( 14 + 18 = 32 \)
- \( 23 · 6 = 138 \)
- \( 120 : 5 = 24 \)
- \( 32 + 138 = 170 \)
- \( 170 - 24 = 146 \)
2. \( 75 : 25 · 17 + 2 · (74 - 25) \)
- \( 74 - 25 = 49 \)
- \( 75 : 25 = 3 \)
- \( 3 · 17 = 51 \)
- \( 2 · 49 = 98 \)
- \( 51 + 98 = 149 \)
3. \( 69 - (91 - 46) · 3 + 18 : 22 \)
- \( 91 - 46 = 45 \)
- \( 45 · 3 = 135 \)
- \( 18 : 22 = \frac{18}{22} = \frac{9}{11} \)
- \( 69 - 135 = -66 \)
- \( -66 + \frac{9}{11} = -65 \frac{2}{11} \)
4. \( 120 : 5 \)
- \( 120 : 5 = 24 \)
Ответ: 146, 149, -65 \(\frac{2}{11}\), 24.