Réponse :
A = 24/5 + (-6/5/1/5) = 24/5 + (- 6) = 24/5 + (-30/5) = - 6/5
B = - 1/2)/(5/2 + 4/9) = - 1/2)/(45/18 + 8/18) = - 1/2)/53/18 = - 18/(2x53) = - 9/53
C = ((2/3) - 4)/((- 8/7) - 2) = (2/3 - 12/3)/(- 8/7 - 14/7) = - 10/3/-22/7 = 10x7/3x22
= 35/33
Explications étape par étape