Réponses

Meilleure réponse !
2013-10-21T18:37:26+02:00
25x-15
=5(5x-3)

(9x+2)(2x-5)+(9x+2)(2-9x)
=(9x+2)(2x-5+2-9x)
=(9x+2)(-7x-3)

(5x-1)(3x+2)+(5x-1)(5x+1)
=(5x-1)(3x+2+5x+1)
=(5x-1)(8x+3)
2013-10-21T18:40:25+02:00
A = 5(5x-3)
B = (9x+2)(2x-5+2-9x)
   =(9x+2)(-7x-3)
C = (5x-1)(3x+2+5x+1)
   =(5x-1)(8x+3)