Bonjour, pouvez-vous m’aider svp? Merci d’avance

Bonjour,

A = 1/9 + 15/9 x 1/6

A = 1/9 + 15/54

A = (1 x 6) / (9 x 6) + 15/54

A = 6/54 + 15/54

A = 21/54

A = (3 x 7) / (3 x 18)

A = 7/18

B = (11/15 - 1/6) x 5/6

B = [(11 x 2) / (15 x 2) - (1 x 5) / (6 x 5)] x 5/6

B = (22/30 - 5/30) x 5/6

B = 17/30 x 5/6

B = 85/180

B = (5 x 17) / (5 x 36)

B = 17/36

C = 5/2 x 15/4 - 2

C = 75/8 - (2 x 8) / (1 x 8)

C = 75/8 - 16/8

C = 59/8