Réponse :
A= 5(x+4) = 5*x + 5*4 = 5x + 20
B= 3(x-2) = 3*x + 3*(-2) = 3x - 6
C= 4(5x-1) = 4*5x + 4*(-1) = 20x - 4
D= x(2+4x) = x*2+x*4x = 2x + 4x²
E= 2x(x-3) = 2x*x + 2x*(-3) = 2x² - 6x
F= 7x(3x-5) = 7x*3x + 7x*(-5) = 21x² - 35x
j'espère t'avoir aidé !
