Réponses

2014-07-02T19:30:05+02:00
Exercice 2
a. A = 7(-3x²) = -21x²
B = 7+5x (on ne peut pas réduire)
C = 7 x 2x = 14x
D = -2x-5x = -7x
E = 9x-x = -8x
F = -4x(-3x) = 12x²
G = -6x² x 5 = -30x²
H = 5x² -9x² = -4x²
I = 4(-3x²) = -12x²

b. I = 6 x 2a - 7x3a
I = 12a - 21a
I = -9a

J = 3b x 5b - 2b x 8b
J = 15b² - 16b²
J = -b²

K = 3c²+5c-13+7c²-8c+21
K = 3c²+7c² +5c-8c -13+21
K = 10c²-3c-8

2014-07-02T20:07:17+02:00
Exercice 2 :

A = 7(- 3x²)
A = - 21x²

B = 7+ 5x (irréductible)

C = 7 * 2x
C = 14x

D = -2x - 5x
D = - 7

E = 9x - x
E = 8x

F = - 4x (- 3x)
F = 12x²

G = -6x² * 5
G = - 30x²

H = 5x² - 9x²
H = - 4x²

I = 4 (- 3x²)
I = -12x²

J = - 6x² + x²
J = - 5x²

I = 6 * 2a - 7 * 3a
I = 12a - 21a
I = - 9a

J = 3b * 5b - 2b * 8b
J = 15b² - 16b²
J = -b²

K = 3c² + 5c - 13 + 7c² - 8c + 21
K = 3c² + 7c² + 5c - 8c - 13 + 21
K = 10c² - 3c + 8