Bonjour,
550 = 10 * 55
550 = 5 * 2 * 55
550 = 5 * 2 * 11 * 5
320 = 32 * 10
320 = 16 * 2 * 5 * 2
320 = 2 * 2 * 2 * 2 * 2 * 5 * 2
425 = 85 * 5
425 = 17 * 5 * 5
1000 = 10 * 10 * 10
1000 = 5 * 2 * 5 * 2 * 5 * 2
Réponse :
Bonjour
a) 550 = 2 × 5² × 11
b) 320 = 2⁶ × 5
c) 425 = 5² × 17
d) 1000 = 2³ × 5³