Răspuns:
X : 6 × 5 = 25
X : 30 = 25
X = 25 × 30
X = 750
X : 7 × 6 = 42
X : 42 = 42
X = 42 × 42
X = 1764
X : 10 × 5 = 25
X : 50 = 25
X = 25 × 50
X = 1250
X : 8 × 5 = 30
X : 40 = 30
X = 30 × 40
X = 1200
X : 7 × 9 = 63
X : 63 = 63
X = 63 × 63
X = 3969
X : 9 × 8 = 64
X : 72 = 64
X = 64 × 72
X = 4608