Réponse :
Explications étape par étape :
* est le signe de la multiplication
/ est le signe de la division
A = (3/5 - 1/2) * 5/2
A = (6/10 - 5/10) * 5/2
A = 1/10 * 5/2
A = 5/20
A = 1/4
B = (3 - 2/3) / (4/3 * 7)
B = (9/3 - 2/3) / (28/3)
B = (7/3) * (3/28)
B = 21 / 84
B = (3*7) / (2*2*3*7)
B = 1/4
C = (8/3 - 2/3) / (8/7)
C = (6/3) / (8/7)
C = 6/3 * 7/8
C = (6*7) / (3*8)
C= (2*3*7) / (3*2*2*2)
C = 7/4
D = (-2/5 + 5/2) / (-3/4 + 1/2)
D = (-4/10 + 25/10) / (-3/4 + 2/4)
D = (21/10) / (-1/4)
D = (21/10) * -4
D = - (21*2*2) / (2*5)
D = - 42 / 5
Inverse de B = 4
Opposé de D = 42/5
Bonjour et bonne journée
