Réponse :

Explications étape par étape

Bonjour

A = -54 - (-9/4) x (-1/3)

A = -54 - (9/3 x 1/4)

A = -54 - 3/4

A = -216/4 - 3/4

A = -219/4

B = (-5/4 + 8)/(-1/4 - 8)

B = (-5/4 + 32/4) / (-1/4 - 32/4)

B = 27/4 / (-33/4)

B = 27/4 x -4/33

B = -4/4 x 27/33

B = -(3 x 9)/(3 x 11)

B = -9/11

C = 2/5 : (13/2 + -12/5)

C = 2/5 : (65/10 - 24/10)

C = 2/5 : 41/10

C = 2/5 x 10/41

C = 10/5 x 2/41

C = 2 x 2/41

C = 4/41