Réponse :
Explications étape par étape
Bonjour
1/4 = (1 x 5)/(4 x 5) = 5/20
2/5 = (2 x 6)/(5 x 6) = 12/30
30/70 = (3 x 10)/(7 x 10) = 3/7
14/40 = (2 x 7)/(2 x 20) = 7/20
9/8 = (9 x 9)/(8 x 9) = 81/72
8 = (8 x 10)/(1 x 10) = 80/10
