2. 1*3 3:3 2:2 5*3 3*8 6:3 21:7 27:3 24:8 18:6 12:4 15:5 (45+35):10 10*(21-16) (62+18):8

Решение:

1. \( 1 \cdot 3 = 3 \)
2. \( 3 : 3 = 1 \)
3. \( 2 : 2 = 1 \)
4. \( 5 \cdot 3 = 15 \)
5. \( 3 \cdot 8 = 24 \)
6. \( 6 : 3 = 2 \)
7. \( 21 : 7 = 3 \)
8. \( 27 : 3 = 9 \)
9. \( 24 : 8 = 3 \)
10. \( 18 : 6 = 3 \)
11. \( 12 : 4 = 3 \)
12. \( 15 : 5 = 3 \)
13. \( (45 + 35) : 10 = 80 : 10 = 8 \)
14. \( 10 \cdot (21 - 16) = 10 \cdot 5 = 50 \)
15. \( (62 + 18) : 8 = 80 : 8 = 10 \)