Réponses

2013-12-11T19:24:00+01:00
Bonsoir
(2x-1)²-((4x-2)(5x-1) 
(2x-1)(2x-1) - 2(2x-1)(5x-1) 
(2x-1)(2x-1) -(2x-1)(10x-2)
(2x-1)(2x-1-10x+2)
(2x-1)(-8x+1)