Bonsoir,

* = X

A = 2x = 2*x = 2*2 = 4

B = 4x+5 = 4*x+5 = 4*2+5 = 8+5 = 13

C = 4*(x-3)*(x+8) = 4*(2-3)*(2+8) = 4*(-1)*10 = (-4)*10 = -40

D = 3*x-2*(5*x-15) = 3*2-2*(5*x-15) = 6-10*x+30 = -10*x+36 = -10x+36

E = 9*x² = 9*2² = 9*4 = 36

F = 7-2*x = 7-2*2 = 7-4 = 3

G = 2*(3*x-2) = 2*(3*2-2) = 2*(6-2) = 2*4 = 8

H = x*(x+2)-4*x = 2*(2+2)-4*2 = 2*4-8 = 8-8 = 0

I = 4*x²-2*x*(4-x) = 4*2²-2*2*(4-2) = 4*4-4*2 = 16-8 = 8

J = -3*x²+5*x-4 = -3*2²+5*2-4 = -3*4+10-4 = -12+6 = -6

Bonne soirée :)