Réponses

2013-12-29T15:59:48+01:00
4 x² -4x +1 +(x+5)(2x-1)            Identité remarquable 4x² -4x +1 =(2x-1)(2x+1)
(2x-1)(2x+1) +(x+5)(2x-1)
(2x-1)(2x+1 +x+5)
(2x-1)(3x +6)

(1-2x)(9x-1)-(9x-1)(7+3x)
(9x-1)(1-2x -7-3x)
(9x-1)(-5x -6)

x(x+5)+x(3x-2)
x(x+5+3x-2)
x(4x +3)