Bonsoir
Développer et réduire chaque expression :
D=-3x(-2x+6)-x(4x-2)
D = 6x² - 18x - 4x² + 2x
D = 6x² - 4x² - 18x + 2x
D = 2x² - 16x
E=6(2x-5)+2x(4x-10)
E = 12x - 30 + 8x² - 10x
E = 8x² + 12x - 10x - 30
E = 8x² + 2x - 30
F=-4(6-5x-9x(2x+3) --> Erreur d'expression
G=-5x(2x-7)+4(3-8x)
G = - 10x² + 35x + 12 - 32x
G = - 10x² + 3x + 12
H=(8+2x)*3+7(3x-5)
H = 24 + 6x + 21x - 35
H = 27x - 11
I=-3x(4x-8)+5x(-7+2x)
I = - 12x² + 24x - 35x + 10x²
I = - 12x² + 10x² + 24x - 35x
I = - 2x² - 11x
J=5x(6-7x)+x(8-2x)
J = 30x - 35x² + 8x - 2x²
J = - 35x² - 2x² + 30x + 8x
J = - 37x² + 38x
K=4x(-2x+3)+2x(3x-5)
K = - 8x² + 12x + 6x² - 10x
K = - 2x² + 2x
L=2(5-2x)-2x(4+5x)
L = 10 - 4x - 8x - 10x²
L = - 10x² - 12x + 10
M=7x(3x-2)-2x(-6+x)
M = 21x² - 14x + 12x - 2x²
M = 19x² - 2x
N=-4(x+3)+5(6+x)
N = - 4x - 12 + 30 + 5x
N = x + 18
O=6x(3x+4)-4(5x+3)
O = 18x² + 24x - 20x - 12
O = 18x² + 4x - 12.
