Voilà mon devoirs maison de maths C'EST URGENT!!! A rendre pour lundi svp, je ne comprends rien du tout

1)
A = 8x x 6
A = 48x

B = 4 x 2x
B = 8x

C = 3x (4x -1) - 6x - 2
C = (3x4x)+(3x-1) -6x -2
C = 12x +(-3) - 6x -2
C = 12x -3 -6x -2
C= 6x -5

D = 5x (-4x-5) +2x
D = (5x-4x) + (5x-5) + 2x
D = - 20x -20 + 2x
D = - 18x -20

E = 3x (2x-2) +8
E = (3x2x) + (3x-2) +8
E = 6x - 6 +8
E = 6x +2

A (je ne sais pas)

B = 4 x 2x
B = 8x

C = 3x (4x -1) - 6x - 2
C = (3x4x)+(3x-1) -6x -2
C = 12x +(-3) - 6x -2
C = 12x -3 -6x -2
C= 6x -5

D = 5x (-4x-5) +2x
D = (5x-4x) + (5x-5) + 2x
D = - 20x -20 + 2x
D = - 18x -20

E = 3x (2x-2) +8
E = (3x2x) + (3x-2) +8
E = 6x - 6 +8
E = 6x +2