Bonjour
Réduire les expressions suivantes :
A.(2x-8)+(9-x²)
A = 2x - 8 + 9 - x²
A = - x² + 2x + 1
B. 12x-x+5x²-3
B = 5x² + 12x - x - 3
B = 5x² + 11x - 3
C. -2x+12+7x-2x²+1
C = - 2x² - 2x + 7x + 12 + 1
C = - 2x² + 5x + 13
D. 7x²-4-(2x²-4x+6)
D = 7x² - 4 - 2x² + 4x - 6
D = 7x² - 2x² + 4x - 4 - 6
D = 5x² + 4x - 10
E. -4x-2x²-2x+6
E = - 2x² - 4x - 2x + 6
E = - 2x² - 6x + 6
F. -5*(9x²)+4*3x-(-2)
F = - 45x² + 12x + 2
G. -x²+7x+5+5x
G = - x² + 7x + 5x + 5
G = - x² + 12x + 5
H. (-3x+6)-(8x²-2)
H = - 3x + 6 - 8x² + 2
H = - 8x² - 3x + 6 + 2
H = - 8x² - 3x + 8.
