Решение:
- 240 \(\cdot\) 3 + 4 \(\cdot\) 2 = 720 + 8 = 728
- 240 : (3 + 4) \(\cdot\) 2 = 240 : 7 \(\cdot\) 2 = \( \frac{240}{7} \) \(\cdot\) 2 = \( \frac{480}{7} \approx 68.57 \)
- 640 : 8 - 4 \(\cdot\) 5 = 80 - 20 = 60
- 640 : (8 - 4) \(\cdot\) 5 = 640 : 4 \(\cdot\) 5 = 160 \(\cdot\) 5 = 800
Ответ: 728; 68,57; 60; 800.