Réponse :

Bonjour

Explications étape par étape

A = 5/6 + -2/3

A = 5/6 X 3/3 -2/3 X 6/6

A = 15/18 -12/18

A = 3/18 = 1/6

B = -13/7 -1/14

B = -13/7 X 2/2 -1/14

B = -26/14 -2/14

B = -28/14

B = - 4/2= -2

F = 1/10 +1 -2/5

F = 1/10 +10/10 -2/5 X 2/2

F = 1/10 +10/10 -4/10

F = 11/10 -4/10 = 7/10

G = 1/4 -2 +2/5

G = 1/4 X 5/5 -2 X 20 +2/5 X 4/4

G = 5/20 -2/20 +8/20

G = 11/20