Réponse :

Explications étape par étape

Bonsoir

Calculer en détaillant :

A = -3/17 + 4/5 : (3/8 - 14/25 x 30/21)

A = -3/17 + 4/5 : (3/8 - 14/21 x 30/25)

A = -3/17 + 4/5 : (3/8 - (2 x 7)/(3 x 7) x (6 x 5)/(5 x 5)

A = -3/17 + 4/5 : (3/8 - 2/3 x 6/5)

A = -3/17 + 4/5 : (3/8 - (2 x 6)/(3 x 5))

A = -3/17 + 4/5 : (3/8 - (2 x 2)/5)

A = -3/17 + 4/5 : (3/8 - 4/5)

A = -3/17 + 4/5 : (15/40 - 32/40)

A = -3/17 + 4/5 : (-17/40)

A = -3/17 + 4/5 x -40/17

A = -3/17 - 40/5 x 4/17

A = -3/17 - 8 x 4/17

A = -3/17 - 32/17

A = -35/17

B = [8/5 : (4/5 - 11/10)] / [8/5 : 4/5 - 11/10]

B = [8/5 : (40/50 - 55/50)] / (8/5 x 5/4 - 11/10)

B = [8/5 : (-15/50)] / (2 - 11/10)

B = [8/5 x -50/15] / (20/10 - 11/10)

B = (8/5 x -10/3) / (9/10)

B = (-10/5 x 8/3)/(9/10)

B = (-2 x 8/3) / (9/10)

B = -16/3 x 10/9

B = -160/27