1. 7*3=21 21: = 21: =3 8. = :3= :8= 9*3= : = : =

Решение:

1. \( 7 \cdot 3 = 21 \)
2. \( 21 : 3 = 7 \)
3. \( 21 : 7 = 3 \)
4. \( 8 \cdot 4 = 32 \)
5. \( 12 : 3 = 4 \)
6. \( 24 : 8 = 3 \)
7. \( 9 \cdot 3 = 27 \)
8. \( 27 : 3 = 9 \)
9. \( 27 : 9 = 3 \)