Bonjour! j'aurais besoin d'aide pour réaliser les calculs dans la photo svp, surtout le C! merci!​

Bonjour

A= 1/2 - 1/3 - 1/6

A = (1 x 3) / (2 x 3) - (1 x 2) / (3 x 2) - 1/6

A = 3/6 - 2/6 - 1/6

A = 3/6 - 3/6

A = 0

B = 7/4 - 15/4 x 1/5

B = 7/4 - 15/20

B = 7/4 - (5 x 3) / (5 x 4)

B = 7/4 - 3/4

B = 4/4

B = 1

C = (3 - 2/9) : (5/6 - 5/9)

C = [(3 x 9) / (1 x 9) - 2/9] : [(5 x 3) / (6 x 3) - (5 x 2) / (9 x 2)]

C = (27/9 - 2/9) : (15/18 - 10/18)

C = 25/9 : 5/18

C = 25/9 x 18/5

C = 450/45

C = (45 x 10)/ (45 x 1)

C = 10.