Réponses

  • Utilisateur Brainly
2014-01-03T21:16:01+01:00
2014-01-03T21:22:43+01:00
A= 5/7 * 3/7 
=15/49

B= -8/11 * 9/-7
=72/77

C= 4/5+7/5
=11/5

D=4/5-7/5
=-3/5