A)
a × 5 × 2 × a = a ×a × a
10 × a × a = a × a × a | : (a × a)
10 = a
a = 10
verificare:
10 × 10 × 10 = 10 × 10 × 10
1 000 = 1 000
B)
a × b × 7 × 8 × a = a × b × a × a
56 × a × b × a = a × b × a × a | : (a × a × b)
56 = a
a = 56
verificare:
56 × 56 × 56 × b = 56 × 56 × 56 × b
175 616 × b = 175 616 × b