Bonsoir,
A = 3*(x+8) + 4*(7x + 2)
A = 3x + 3*8 + 4*7x + 4*2
A = 3x + 24 + 28x + 8
A = 31x + 32
B = 5(x-1) - 7x(2+3x)
B = 5x-5 - 7x*2 - 7x*3x
B = 5x-5-14x-21x²
B = -21x² - 9x - 5
C = 2x(4-5x) - (x-7)
C = 2x*4 - 2x*5x - x + 7
C = 8x - 10x² - x + 7
C = -10x² - 7x + 7
D = (3-8x) - 5(4x-7)
D = 3 - 8x - 5*4x + 5*7
D = 3 - 8x - 20x + 35
D = -28x + 38
E = 7(3-2x) - 4x(2x-1)
E = 7*3 - 7*2x - 4x*2x + 4x
E = 21 - 14x - 8x² + 4x
E = -8x² - 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
Bonne soirée
