Bonjour, pouvez-vous m'aider avec cet exercice SVP! Merci d'avance:)

Bonjour,

A = 4/7 : (2 - 3/5 + 4/7)

A = 4/7 : [(2 x 35) / (1 x 35) - (3 x 7) / (5 x 7) + (4 x 5) / (7 x 5)]

A = 4/7 : (70/35 - 21/35 + 20/35)

A = 4/7 : 69/35

A = 4/7 x 35/69

A = 140/483

A = (7 x 20) / (7 x 69)

A = 20/69

B = 13/7 - 2/7 x (- 15/12)

B = (13 x 12) / (7 x 12) + 30/84

B = 156/84 + 30/84

B = 196/84

B = (28 x 7) / (28 x 3)

B = 7/3

C = (3 + 1/3) : (- 28/96)

C = [3 x 3) / (1 x 3) + 1/3] x - 96/28

C = (9/3 + 1/3) x - 96/28

C = 10/3 x - 96/28

C = - 960/84

C = (12 x - 80) / (12 x 7)

C = - 80/7

D = (5/6 - 2/3) + 4/3 x 15/8

D = [5/6 - (2 x 2) / (2 x 3)] + 60/24

D = (5/6 - 4/6) + 60/24

D = 1/6 + 60/24

D = (1 x 4) / (6 x 4) + 60/24

D = 4/24 + 60/24

D = 64/24

D = (8 x 8) / (8 x 3)

D = 8/3.