a. 3(2x + 1) + 6x = b. 17x + 4x(5-x) = c. 6(3-1,5x) - 9x = d. 4x(3x + 2) + 5x(3-2x) = e. 5(2x + 4)-(8-3x) = f. 5(x-4)-3(2x-5)= ​

Bonjour;

a. 3(2x + 1) + 6x

=6x +3 +6x

= 12x +3

b. 17x + 4x(5-x)

=17x +20x -4x²

= -4x² +37x

c. 6(3-1,5x) - 9x

= 18 -9x -9x

= -18x +18

d. 4x(3x + 2) + 5x(3-2x)

=12x² +8x +15x -10x²

=  2x² +23x

e. 5(2x + 4)-(8-3x)

=10x +20 -8+3x

=  13x +12x

f. 5(x-4)-3(2x-5)

= ​ 5x -20 -6x +15

= -x -5

Réponse :

bonjour

Explications étape par étape :

a. 3(2x + 1) + 6x

=6x+6+6x

=12x+6

=6(2x+1)

b. 17x + 4x(5-x)

17x+20x-4x²

=-4x²+37x

=x(4x+37)

c. 6(3-1,5x) - 9x

=18-9x-9x

=18-18x

=18(1-x)

d. 4x(3x + 2) + 5x(3-2x)

12x²+8x+15x-10x²

=2x²+23x

=x(2x+23)

e. 5(2x + 4)-(8-3x)

=10x+20-8+3x

=13x+12

f. 5(x-4)-3(2x-5)

=5x-20-6x+15

=-x-5