Réponse :
Bonsoir
Explications étape par étape
Exercice 2
L = (1/8 +7/12) X (6/5 : 4/15)
L = (12/96 +56/96) X (6/5 X 15/4)
L = (68/96) X (90/20) je simplifie
L = 68/96 : 2/2 = 34/48 = 17/24
L = 17/24 X 9/2
L = 153/48
M = -14/15 + 10/15 X 7/20
M = -14/15 +70/300
M = -14/15 + 7/30
M ) -14/15 X 2/2 +7/30
M = -28/30 +7/30
M = -21/30 : 3/3 = -7/10