Sagot :
Salut !
Réponse :
A = 5x -2) x (3x + 2) -2 (x+1) x (5x -2)
A = (5x -2) x (3x = 2 - 2 ( x + 1))
A = (5x - 2) x (3x + 2 - 2x -2)
A = (5 x - 2) x
A = X x (5x-2)
B = (6x - 9) x (x + 2) + (2x -3) x (x+7)
B = 6 x² + 12 x - 9 x - 18 + (2x -3) x (x+7)
B = 6 x² + 12 x - 9 x - 18 + 2x² + 14 x -3x - 21
B = 8x² + 12 x - 9x - 18 + 14x - 3x - 21 donc 8x² + 14 x - 18 - 21
B = 8x² + 14x - 39
C = 5 (x+2)² - (x + 2) x (5x +6)
C = (x+ 2) x (5(x+2) - (5 x 6))
C = (x + 2) x 5x + 10 - 5x -6)
C = ( x + 2) x 4
C = 4(x+2)
D = (3x - 1) x (x+2) + (3 x -1)²
D = (3 x - 1) x (x + 2 + 3x - 1)
D = (3x - 1) x (4x + 2 - 1)
D = (3x - 1) x 4x + 1
D = (3x - 1) x (4x + 1)
E = 6x + (5x - 2) x (3x + 2) + 4
E = 2 ( 3x + 2) + (5x - 2) x (3x + 2)
E = (3x + 2) x (2 + 5x - 2)
E = ( 3x + 2) x 5x
E = 5x x (3x +2)
F = 64 + 80 x + 25x² - (8+5x) x ( 4x + 3)
F = 64 + 80 x + 25x² - ( 32 x + 24 + 20x² + 15x)
F = 64 + 80 x + 25x² - ( 47x + 24 + 20x²)
F = 40 + 33 x + 5x²
F = 5x² + 33x + 40
G = (2x + 3) x (8- 2x) + 4x² -9
G = (2x + 3) x (8- 2x) x (2x - 3) x (2x + 3)
G = (2x + 3) x (8- 2x + 2x - 3)
G = (2x + 3) x 5
G = 5 (2x + 3)
H = (8x + 1)² - 5x + 9)²
H = (8x + 1 - ( 5x + 9)) x (8x + 1 + (5x + 9))
H = (8x + 1 - 5x - 9) x (8x + 1 + 5x + 9)
H = (3x + 1 - 9) x (8x + 1 + 5x + 9) puis (3x - 8) x (8x + 1 + 5x + 9) et enfin
(3x - 8) x (13x + 1 + 9)
H = (3x - 8) x (13x + 10)
Bonne journée et bon courage : )