Sagot :
Bonjour,
D = (2x - 5)(3x - 2)
D = 6x² - 4x - 15x + 10
D = 6x² - 19x + 10
E = (2x + 3)(5x - 8) - (2x - 4)(5x - 1)
E = (10x² - 16x + 15x - 24) - (10x² - 2x - 20x + 4)
E = 10x² - x - 24 - 10x² + 22x - 4
E = 21x - 28
F = (5x - 2)(5x - 8) - (3x - 5)(x + 7)
F = (25x² - 40x - 10x + 16) - (3x² + 21x - 5x - 35)
F = 25x² - 50x + 16 - 3x² - 16x + 35
F = 22x² - 66x + 51
G = 2(x + 7)(3 - 2x) + (5x - 2)(4x + 1)
G = 2(3x - 2x² + 21 - 14x) + (20x² + 5x - 8x - 2)
G = 6x - 4x² + 42 - 28x + 20x² - 3x - 2
G = -25x + 16x² + 40