Réponses

  • Utilisateur Brainly
2013-12-04T18:01:04+01:00
Sachant que b(b-a)=6,calculer.
(a-b)² - (a+b) (a-b)

=a²-2ab+b²-(a²-b²)
=2b²-2ab
=2b(b-a)
=12