Exercice n°1 :(6 points) Développer, réduire et ordonner les expressions suivantes : . (2x+1)(3 – x) 1 point • 2x (4x + 3)-3(5+2x)(1-3x) 1,5 points • (-2+3x)(5

Réponse:

(2x-1)(x+3)

A = 2x2-6x-x+3

A = 2x2-7x+3

B = 2(1-x)(6x-1)

B = 2(6x-1-6x2+x)

B = 2(-6x2+7x-1)

B = -12x2+14-2

C = (2x-1/2)2

C = 4x2-2x+1/4

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

D = (-3x+6)(2x-1)

D = -6x2+3x+12x-6

D = -6x2+15x-6

E = 2(x-1)(x+1)

E = 2(x2-12)

E = 2x2-2

F = 4(1-2x)2

F = 4(1-4x+4x2)

F = 4-16x+16x2

F = 16x2-16x+4

G = (3x-1)(x+1)-2(x2-3)

G = 3x2+3x-x-1-2x2-6

G = x2+2x+5

H = (x-1)2 +3(1-x)(x+2)

H = x2-2x+1+3(x+2-x2-2x)

H = x2-2x+1+3x+6-3x2-6x

H = -2x2-5x+7

I = 3x(x+1)(x+2)

I = 3x(x2+3x+2)

I = 3x3+9x2+6x

J = (x+1)(x-2)(x+2)

J = (x-1)(x2-22)

J = (x-1)(x2-4)

J = x3-4x-x2+4

J = x3-x2-4x+4