1)EXERCICE

A= 3x+6

=3(x+2)

B= -5(2y+7)

-5×2y-5×7

= -10y-35

C= 4w au carré

= (2w)au carré

D= 2u×(5-7)

4u×5-4u×2u

20u-4u×2u

=20-8u au carré

2) EXERCICE

E=5x+(2x-3)

5x+2x-3

=7x-3

F=3x-(-x+7)

3x+x-7

=4x-7

3) EXERCICE

G= 5x-4+7x-8x+6

4×-4+6

4x+2

=2(2x+1)

H= ?

5) EXERCICE

M=6(x+2)

6x+6×2

6×12

6×+12

N=12(4x-3)

12×4x-12×3

48x-12×3

=48x-36

6) EXERCICE

P= 7a-14

7(a-2)

7(a-2)

Q= 144+6×18

162+6x

162+6x

7)EXERCICE

R=3(x+5)-x

3x+15-x

2x+15

2x+15

S=3x×(-4+x)

-3x×4+3x×x

-12x+3x×x

-12x+3x au carré

T=(2x-3)(4+x)

2x×4+2x×x-3×4-3x

8x+2x×x-3×4-3x

8x+2x au carré -3×4-3x

8x2x au carré -12-3x

5x+2x au carré -12

2x au carré +5x-12

V= 5z(4x+3)(-2z-5)

(20×z-15z)×(-2z-5)

-40z au carré -100×z-30z au carré - 75z

bon courage....