Répondre :
Réponse:
A= 3*x+3*8 + 4*7x+4*2
=3x+24+28x+8
=31x + 32
B= (5*x-5*1) - (7x*2-7x*3x)
= 5x-5 - (14x-21x^2)
= 5x-5-14x+21x^2
= 21x^2-9x-5
C= 2x*4-2x*5x
= 8x-10x^2
=-10x^2+8x
bonjour
A = 3(x+8)+4(7x+2)
= 3 x + 24 + 28 x + 8
= 31 x + 32
B =5(x-1)-7x(2 + 3x)
= 5 x - 5 - 14 x - 21 x²
= - 21 x² - 9 x - 5
C=2x(4-5x) = 8 x - 10 x²
D=(3-8x)-5(4x-7)
= 3 - 8 x - 20 x + 35
= - 28 x + 38
E=7(3-2x) - 4x(2x-1)
= 21 - 14 x - 8 x² + 4 x
= - 8 x² - 10 x + 21
F= 7x-5(2-9x)+7(9x-1)
= 7 x - 10 + 45 x + 63 x - 7
= 115 x - 17
bonne soirée