Réponses

2013-02-24T12:18:09+01:00
(2x+1)(x-5) = 2x2 - 10x +x -5 = 2x2 -9x -5. (7x-3)(1-2x) = 7x -14x2 -3 + 6x = -14x2 + 13x -3 (3-2x)(1+x) = 3+ 3x - 2x - 2x2 =2x2+x+3