Bonsoir je n'arrive pas ces deux exos de maths svp.

exercice 15
a. A = 5x+2x+10x
B = 27x²-27x+27
C = 9x(x-3)+9x(10+2x)
D = (2x+1)(8+x)-(3x-1)(2x+1)

b. A = x(5+2+10) = 17x
B = 27(x²-x+1)
C = 9x(x-3+10+2x) = 9x(3x+7)
D = (2x+1)(8+x-3x+1) = (2x+1)(9-2x)

Exercice 16
a. E = 10x²-5x+15 = 2*5x²-5x+3*5 (* signifie multiplié par)
F = 4x²+7x = 4x*x+7x
G = 9x²(x+1)+6x(5+x) = 3x*3x(x+1)+2*3x(5+x)
H = (11x-3)²+(11x-3)(5+9x) = (11x-3)(11x-3)+(11x-3)(5+9x)

b. E = 5(2x²-x+3)
F = x(4x+7)
G = 3x[3x(x+1)+2(5+x)° = 3x(3x²+3x+10+2x)=3x(3x²+5x+10)
H = (11x-3)(11x-3+5+9x) = (11x-3)(20x+2)