Réponse :
Bonjour
Explications étape par étape
Exercice 39
A = (4/5 -1/15) X (1/6 +1/4)
A = (4/5 X 3/3 -1/15) X (1/6 X 4/4 +1/4 X 6/6)
A = (12/15 -1/15) X (4/24 + 6/24)
A = 11/15 X 10/24
A = 110/360 = 11/36
B = 4/3 X ( 1/8 -1)
B = 4/3 X (1/8 -1 X 8/8)
B = 4/3 X (1/8 -8/8)
B = 4/3 X -7/8
B = -28/24 = -14/12 = -7/6
C = -9/4 X 5/9 = -45/36 = -45/36 = -45/36 = -45/36 X 12/5 =
1 -7/12 1 X 12/12 -7/12 12/12 -7/12 5/12
C = -540/180 = -54/18 = -6/2 = -3
