Réponse :

Bonjour

Explications étape par étape :

A = 5/8 - 5/4

A = 5/8 -5/4 X 2/2

A = 5/8 -10/8

A = -5/8

B = 2 + 2/3

B = 2X 3/3 + 2/3

B = 6/3 + 2/3

B = 8/3

C = 4/5 X 5

C = 20/5 = 4

D = 18/19 X 14/27

D = 252/513 : 9/9

D = 28/57