Bonjour,
a) 126/240 = (2 × 63) / (2 × 120)
= 63/120
= (21 × 3) / (40 × 3)
= 21/40 ✅
b) (25 × 27) / (72 × 75) = (25 × 27) / (72 × 25 × 3)
= 27 / (72 × 3)
= (9 × 3) / (72 × 3)
= 9/72 = (1 × 9) / (8 × 9) = 1/8 ✅
c) 9876 / 12345 = (2469 × 4) / (2469 × 5)
= 4/5 ✅
Bonne journée !
