2. 240:3+7.2 240:(3+7).2 640:8-4.5 640:(8-4).5 0.28:4 1.28:4

2. Вычислим:
* \(240:3+7 \cdot 2 = 80 + 14 = 94\)
* (240:(3+7) \(\cdot\) 2 = 240:10 \(\cdot\) 2 = 24 \(\cdot\) 2 = 48)
* \(640:8-4 \cdot 5 = 80 - 20 = 60\)
* (640:(8-4) \(\cdot\) 5 = 640:4 \(\cdot\) 5 = 160 \(\cdot\) 5 = 800)
* \(0 \cdot 28:4 = 0 \cdot 7 = 0\)
* \(1 \cdot 28:4 = 1 \cdot 7 = 7\)