Réponses

2012-10-04T19:43:48+02:00

Bonsoir

=((3x+1)(6x-9))-(2x-3)²

=(18x²-27x+6x-9)-(2x-3)²

=(18x²-21x-9)-(4x²-9)

=18x²-21x-9-4x²+9

=14x²-21x

 

Voila bonne soirée

By Vetteliste