Réponses

2013-09-18T16:47:32+02:00
3)
(-4x+2)(-2x+12)
4)
(2x-1)²-(-3x+4)(2x-1)=(2x-1)[(2x-1-(-3x+4)]=(2x-1)(2x-1+3x-4)=(2x-1)(5x-5)