Réponses

2012-12-15T19:17:44+01:00

C= (2x+3)(5-3x+8)

   =(2x+3)(13-3x)

 

D=(9x-1)(1-2x+7+3x)

   =(9x-1)(x+8)

2012-12-15T19:22:03+01:00

C = 2x+3(5-(3x+8))

C = 2x+3(5-3x-8)

C = (2x+3)(-3-3x)

 

D = 9x-1(1-2x-(7+3x))

D = 9x-1(1-2x-7-3x)

D = (9x-1)(-6-5x)

 

tu mets les facteurs communs devant