Svp aider moi pour exercice 4.Merci

Bonsoir,

A = 13/4 - 7/4 x 5/6

A = 13/4 - 35/24

A = (13 x 6) / (4 x 6) - 35/24

A = 78/24 - 35/24

A = 43/24

B = 2 - 8/13 x 8/5

B = 2 - 64/65

B = (2 x 65) / (1 x 65)

B = 130/65

B = (65 x 2) / (65 x 1)

B = 2

C = 5/72 - (2/3 + 1/12)

C = 5/72 - [(2 x 24) / (3 x 24) + (1 x 6) / (12 x 6)]

C = 5/72 - (48/72 + 6/72)

C = 5/72 - 54/72

C = - 49/72