Réponse :
A= (2x + 1) (x-3) + (2x+1)
A= (2x + 1) (x-3) + (2x+1) * 1 ( * signifie multiplier)
A = (2x +1 ) (x - 3 +1)
A = (2x +1 ) ( x -2)
B = (3x +2) - (2x -7)(3x +2)
B = (3x +2) ( 1 -(2x -7))
B = (3x +2) ( 1 -2x +7)
B = (3x +2) ( 8 - 2x)
C = -x - (3x -2)x
C= -x (1 + 3x -2)
C = -x (3x -1)
j'espère avoir aidé.
