Bonjour/Bonsoir pourriez-vous m'aider pour cet exercice cela me serait d'une grande aide merci ^^.

je t'envoie en pièce jointe les réponses.

Bonjour,

A = 13/7 - (4/3 + 11/21)

A = (13 x 3) / (7 x 3) - [(4 x 7) / (3 x 7) + 11/21]

A = 39/21 - (28/21 + 11/21)

A = 39/21 - 39/21

A = 0

B = (- 5/4) x (- 4/7) x (11/15)

B = 20/28 x 11/15

B = 220/420

B = (20 x 11) / (20 x 21)

B = 11/21

C = (3 - 2/3) / (- 4/7 x 14/3)

C = [(3 x 3) / (1 x 3) - 2/3] : - 56/21

C = (9/3 - 2/3) : - 56/21

C = 7/3 x - 21/56

C = - 147/168

C = (21 x - 7) / (21 x 8)

C = - 7/8

D = - 9/2 + 4/5 x (- 10/16)

D = - 9/2 - 40/80

D = - 9/2 - (40 x 1) / (40 x 2)

D = - 9/2 - 1/2

D = - 10/2

D = (2 x - 5) / (2 x 1)

D = - 5

E = 11/20 - (- 4/3) x (- 21/80)

E = 11/20 - 84/240

E = 11/20 - (12 x 7) / (12 x 20)

E = 11/20 - 7/20

E = 4/20

E = (4 x 1) / (4 x 5)

E = 1/5.