pouvez vous m'aider svp merci beaucoup A=3(x+8)+4(7x+2) développer et réduire B=5(x-1)-7x(2+3x) C=2x(4-5x)-(x-7) D=(38x)-5(4x-7) E= 7(3-2x)-4x(2x-1) F=7x-5(2-9

Bonsoir,

A=3(x+8)+4(7x+2) 
A = 3x + 24 + 28x + 2
A = 3x + 28x + 24 + 2
A = 31x + 26

B=5(x-1)-7x(2+3x)
B = 5x - 5 - 14x - 21x²
B = - 2x² + 5x - 14x - 5
B = - 2x² - 9x - 5

C=2x(4-5x)-(x-7)
C = 8x - 10x² - x + 7
C = - 10x² + 8x - x + 7
C = - 10x² + 7x + 7

D=(38x)-5(4x-7)
D = 38x - 20x + 35
D = 18x + 35

E= 7(3-2x)-4x(2x-1)
E = 21 - 14x - 8x² + 4x
E = - 8x² - 14x + 4x + 21
E = - 8x² - 10x + 21

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

A = 3(x+8) + 4(7x+2)      B = 5(x-1) - 7x(2+3x)
= 3x + 24 + 28x + 8            = 5x -5 - 14x - 21x^2
= 31x + 32                          = -21x^2 - 9x -5

C = 2x(4-5x) - (x-7)          D = 38x - 5(4x-7)
= 8x -  10x^2 - x - 7             = 38x - 20x -35
= -10x^2 + 9x - 7                = 18x - 35

E = 7(3-2x) - 4x(2x - 1)      F= 7x - 5(2-9x) + 7(9x - 1)
= 21 -14x - 8x^2 - 4                 =7x - 10 -45x + 63x - 7
= -8x^2 -14x - 17                  = 25x -17