7. 15:5 15·3 24:3 18·3 1+8 1·8 6+0 6·0

1. $$15 : 5 = 3$$
2. $$15 \cdot 3 = 45$$
3. $$24 : 3 = 8$$
4. $$18 \cdot 3 = 54$$
5. $$1 + 8 = 9$$
6. $$1 \cdot 8 = 8$$
7. $$6 + 0 = 6$$
8. $$6 \cdot 0 = 0$$

Ответ: 3; 45; 8; 54; 9; 8; 6; 0