Răspuns:
Explicație pas cu pas:
36 : 9 = ? : ?
36 : 9 = 32 : 8
36 : 9 = 4
36 : 9 = 16 : 4 = 12 : 3 = 8 : 2 = 20 : 5
____________________________
42 : 7 = ? : 9
42 : 7 = 54 : 9
42 : 7 = 6
6 × 9 = 54
___________________________
1 × ? = 63 : 9
1 × ? = 7
? = 7 : 1
? = 7
1 × 7 = 63 : 9
_____________________
? × 3 = ? × 4
4 × 3 = 3 × 4
8 × 3 = 6 × 4
______________
? × ? = 72 : 9
? × ? = 8
2 × 4 = 8
1 × 8 = 8
4 × 2 = 8
