Réponse :
*A = 5(2x - 7) = 10x - 35
10x = 35
x = 35/10 = 3,5
*C = 4 - 3(x - 5) = 4 - 3x + 15 = 19 - 3x
3x = 19
x = 19/3
*B = -4(-3x + 1) =12x - 4
12x = 4
x = 4/12 = 1/3
*D = 5x - 5(-2x + 1) = 5x + 10x - 5 = 15x - 5
15x = 5
x = 5/15 = 1/3
* E = 2(3x + 5) - (4(x + 2) = 6x + 10 - 4x - 8 = 2x + 2
2x = -2
x = -2/2 = -1
*F = (2x - 3)(-x +2) = -2x + 4x + 3x - 6 = 5x - 6
5x = 6
x = 6/5
*E = (-3x - 4)(8x - 7) = -24x² + 21x - 32x + 28 = -24x² - 11x + 28
H = 4x(3x - 1) - (3x - 7)(5 - 3x) = 12x² - 4x - 15x + 9x² + 35 - 21x = 21x² - 40x + 35
Explications étape par étape
