Réponses

2014-01-28T02:55:34+01:00
A) (2x+1)*+(2x+1)=
2* (2x+1)
B) 3(2x-3)*-(2x-3)=
(2x-3) (3-1) =
2* (2x-3)
C) (x+4)(3x+4)-(x+4)=
(x+4) (3x+4 -1) =
(x+4) (3x+3)
D) (3x+7)(2x+1)+(x-4)(-2x-1)=
(3x+7) (2x+1) + (x-4) (-1) (2x+1)=
(2x+1) (3x+7- x +4) =
(2x+1) (2x + 11)