Réponse :
bonjour
Explications étape par étape :
exercice 33
a/7/18 + 1/6 = 7/18 + 3/18 = 10/18 = 5/9
b/ 21/10 - 9/40 = 84/40 - 9/40 = 75/40 = 15/8
c/ 14/60 + 9/15 = 14/60 + 36/60 = 50/60 = 5/6
d/ 7/8 + 35/48 = 42/48 + 35/48 = 77/48 (= 1 + 29/48)
exercice 34
a/ 27/28 + 3/4 = 27/48 + 36/48 = 63/48 = 21/16 ( = 1 + 5/16)
b/ 25/14 - 30/42 = 75/42 - 30/42 = 45/42 = 15/14 (= 1 + 1/14)
c/ 25/36 - 2/3 = 25/36 - 24/36 = 1/36
d/39/40 - 4/5 = 39/40 - 32/40 = 7/40
