Réponse : Exercice 1
Explications étape par étape
10/15 = 10:5/15:5 = 5/3
13/39 = 13:13/39:13 = 1/3
18/30 = 18:6/30:6 = 3:5
99/44 = 99:11/44:11 = 9/4
36/56 = 36:4/56:4 = 9/14
14/21 = 14:7/21:7 =2/3
