Réponse :
Explications étape par étape
Bonjour
A = 4/5 + 3/5 x 1/2
A = 4/5 + 3/10
A = (4 x 2)/(5 x 2) + 3/10
A = 8/10 + 3/10
A = 11/10
B = 15/4 - 8/4 x 2
B = 15/4 - 16/4
B = -1/4
C = (4/5 + 3/5) x 1/2
C = 7/5 x 1/2
C = 7/10
D = (15/4 - 8/4) x 2
D = 7/4 x 2
D = 7 x 2/4
D = 7 x 2/(2 x 2)
D = 7/2