Bonjour je n’y arrive pas j’ai besoin d’aide svp

Bonsoir,

x = 5/6 ; y = - 1/24 ; z = - 7/12

A = x + y + z

A = 5/6 - 1/24 - 7/12

A = (5 x 4) / (6 x 4) - 1/24 - (7 x 2) / (12 x 2)

A = 20/24 - 1/24 - 14/24

A = 20/24 - 15/24

A = 5/24

B = x - y + z

B = 5/6 - (- 1/24) - 7/12

B = 20/24 + 1/24 - 14/24

B = 21/24 - 14/24

B = 7/24

C = x - (y + z)

C = 5/6 - (- 1/24 - 7/12)

C = 20/24 - (- 1/24 - 14/24)

C = 20/24 - (- 15/24)

C = 20/24 + 15/24

C = 35/24.