bjr

tu as toutes les explications pour les calculs..

donc on applique :

A = 1/2 + 5/2 x 3/4

A = 1/2 + 15/8

A = 4/8 + 15/8

A = 19/8

B = 5/7 - 4/3 : 14/5

B = 5/7 - 4/3 x 5/14

B = 5/7 - 20/42

B = 30/42 - 20/42

B = 15/42

B = 5/14

C= .. coupé sur la droite

D = (1+2/3) / 5

D = 5/3 x 1/5

D = 1/3

E = 4 / (1/3 + 1)

E = 4 / (4/3)

E = 4 x 3/4 = 3

F = (1-4/3) / (1+4/3)

F = (-1/3) / 7/3

F = -1/3 x 3/7 = -1/7

allez je te laisse le G pour la route :)