Решение:
- \( 31 - 4 - 52 = 27 - 52 = -25 \)
- \( 4 \cdot 18 + 45 = 72 + 45 = 117 \)
- \( 65 : 5 + 40 = 13 + 40 = 53 \)
- \( 50 \cdot 5 - 70 = 250 - 70 = 180 \)
- \( 76 : 4 + 15 = 19 + 15 = 34 \)
- \( 26 - 3 \cdot 18 = 26 - 54 = -28 \)
Ответ: -25, 117, 53, 180, 34, -28.