Bonjour, je suis en 5ème et j'ai besoin d'aide pour un excercie de fraction ​

Bonjour

A = 13/8 + 5/2 + 3/4

A = 13/8 + (5 x 4) / (2 x 4) + (3 x 2) / (4 x 2)

A = 13/8 + 20/8 + 6/8

A = 39/8

B = 5/12 + 11/24 + 1/6

B = (5 x 2) / (12 x 2) + 11/24 + (1 x 4) / (6 x 4)

B = 10/24 + 11/24 + 4/24

B = 25/24

C = 2 + 3/7 + 11/14

C = (2 x 14) / (1 x 14) + (3 x 2) / (7 x 2) + 11/14

C = 28/14 + 6/14 + 11/14

C = 45/14

D = 3/5 + 4/15 + 7/30

D = (3 x 6) / (5 x 2) + (4 x 2) /  (15 x 2) + 7/30

D = 18/30 + 8/30 + 7/30

D = 33/30

D = (3 x 11) / (3 x 10)

D = 11/10

E = 15/9 + 2/3 - 6/18

E = (15 x 2) / (9 x 2) + (2 x 6) / (3 x 6) - 6/18

E = 30/18 + 12/18 - 6/18

E = 36/18

E = (18 x 2) / (18 x 1)

E = 2

F = 1 + 9/34 + 3/2

F = (1 x 34) / (1 x 34) + 9/34 + (3 x 17) / (2 x 17)

F = 34/34 + 9/34 + 51/34

F = 94/34

F = (2 x 47) / (2 x 17)

F = 47/17.