Réponse :
Explications étape par étape :
a. 5 sur 3 = 5/3 = 5/3 x 12/12 = 60/36 car 36 =3 x 12
b. 5 sur 12 = 5/12 = 5/12 x 3/3 = 15/36 car 36 =12 x 3
c. 1 sur 6 = 1/6 = 1/6 x 6/6 = 6/36 car 36 = 6 x 6
d. 11 sur 4 = 11/4 = 11/4 x 9/9 = 99/36 car 36 = 4 x 9
e. 7 sur 9 = 7/9 = 7/9 x 4/4 = 28/36 car 36 = 9 x 4
f. 2 sur 1 = 2/1 = 2/1 x 36/36 = 72/36 car 36 = 1 x 36