Réponses

  • Utilisateur Brainly
2014-10-24T17:51:07+02:00
A= 5/7 - 2/7 x 1/6
A= 5/7 - 2/42
A= 30/42 - 2/42
A= 28/42
A= 2/3

B= (2/3 - 3) : 1/9
B= - 7/3 x 9/1
B= - 63/3
B= - 21

C= (1/4 - 1/5) x (7 + 37/9)
C= (5/20 - 4/20) x (63/9 + 37/9)
C= 1/20 x 100/9
C= 100/180
C= 5/9