Réponse :

coucou,

Exercice2:

A= 4*(5x -6) -(6x -10)

= 20x -24 -6x +10

= 14x - 14

B= (5x -1)(2 -x ) -9

= 10x -5x² -2 +x -9

= 11x - 5x² - 11

C= (3x -8 )(x+5 )= 3x² + 7x - 40

D= (x - 2)( 8x+ 5)=8x² - 11x -10  

E= x(x+6) + (7 -x)(2+x)

= x² +6x +14 +7x -2x -x²

= 11x + 14

Exercice 3:

F= 12 -3x

= (4*3) - (3*x)

= 3 (4-x)

le reste ..........?