Выполним указанные действия:
1. $$603 \cdot 8 = 4824$$
2. $$4123 \cdot 2 = 8246$$
3. $$1200 \cdot 4 = 4800$$
4. $$1635 : 5 = 327$$
5. $$721 : 3 = 240 \frac{1}{3}$$ или $$240.33$$ (округленно)
6. $$5910 : 3 = 1970$$
**Ответ:**
* $$603 \cdot 8 = 4824$$
* $$4123 \cdot 2 = 8246$$
* $$1200 \cdot 4 = 4800$$
* $$1635 : 5 = 327$$
* $$721 : 3 = 240 \frac{1}{3}$$ или $$240.33$$
* $$5910 : 3 = 1970$$