Réponses

2014-03-05T10:26:36+01:00
  • Utilisateur Brainly
2014-03-05T10:29:18+01:00
on donne a =6/7 et b =4/7

a) a+b  =6/7+4/7=11/7         

b) a-b =6/7-4/7=2/7         

c) ab
=6/7*4/7=24/49