Bonjour svp aidez moi c'est pour demain Developper et reduire les expressions : D = (3-8x) - (4x-7) E = 7(3 - 2x) - 4x (2x -1) F = 7x - 5(2 - 9x) + 7(9x - 1)

Bonjour,

• Developper :

D = (3 - 8x) - (4x - 7)
D = 3 - 8x - 4x - (-7)
D = 3 - 8x - 4x + 7
D = - 12x + 10

E = 7(3 - 2x) - 4x(2x - 1)
E = 7 * 3 + 7 * (-2x) - 4x * 2x - 4x * (-1)
E = 21 - 14x - 8x^2 + 4x
E = -8x^2 - 10x + 21

F = 7x - 5(2 - 9x) + 7(9x - 1)
F = 7x - 5 * 2 - 5 * (-9x) + 7 * 9x + 7 * (-1)
F = 7x - 10 + 45x + 63x - 7
F = 115x - 17