Réponse :
Bonsoir
1) 84 = 2² × 3 × 7
270 = 2 × 3³ × 5
2) a) PPCM(84 ; 270) = 2² × 3³ × 5 × 7 = 3780
b) PGCD(84 ; 270) = 2 × 3 = 6
3) 450 = 2 × 3² × 5²
750 = 2 × 3 × 5³
PPCM(450 ; 750) = 2 × 3² × 5³ = 2250
PGCD(450 ; 750) = 2 × 3 × 5² = 150
