Răspuns:
12:3=4
Verificare:4x3=12
2x10=20
Verificare :20-10-10=0
20:10=2
2x6=12
6+6=12
12-6-6=0
12:6=2
3x9=27
9+9+9=27
27:9=3
27-9-9-9=0
