Réponses

  • Utilisateur Brainly
2014-09-13T14:39:22+02:00
A= 17/15 - 2/15 x 9/4
A= 17/15 - 18/60
A= (17*4)/(15*4) - 18/60
A= 68/60 - 18/60
A= 50/60
A= 5/6

B= 
(- 4 + 3 x 2/7) / 11/14
B= (- 4 + 6/7) / 11/14
B= (- 28/7 + 6/7) / 11/14
B= - 22/7 / 11/14
B= - 22/7 x 14/11
B= - 2 x 2
B= - 4

C= 
(5/6 - 5/4) / (5/8)
C= ((5*4)/(6*4) - (5*6)/(4*6)) x 8/5
C= (20/24 - 30/24) x 8/5
C= - 10/24 x 8/5
C= - 2/3