Réponse :
Explications étape par étape
Exercice 1
a) 5/8 = 20/32
b) 21/56 = 3/8
c) 76/12 = 38/6 = 19/3
Exercice 2
a) 4/24 = 1/6
b) 36/81 = 4/9
Exercice 3
a) 6/4 > 14/12
b) 28/35 > 9/15
Exercice 4
a) 7/5 + 4/15 = 105/75 + 20/75 = 125/75 = 5/3
b) 3/12 + 1 = 1/4 + 1 = 1/4 + 4/4 = 5/4
c) 3/4 - 9/20 = 60/80 - 36/80 = 24/80 = 3/10
