Sagot :
Bonjour
A = (2x - 1) (5x - 4)
A = 10x² - 8x - 5x + 4
A = 10x² - 13x + 4
B = (4x - 1)² + 3x - 2
B = 16x² - 8x + 1 + 3x - 2
B = 16x² - 5x - 1
C = (2x + 4)² + (5x - 3)²
C = 4x² + 16x + 16 + 25x² - 30x + 9
C = 4x² + 25x² + 16x - 30x + 16 + 9
C = 29x²- 14x + 25
D = (x + 1) (x - 1) - (3 - 2x)²
D = x² - 1 - (9 - 12x + 4x²)
D = x² - 1 - 9 + 12x - 4x²
D = x² - 4x² + 12x - 1 - 9
D = - 3x² + 12x - 10