Pouvez-vous m’aider à faire ce DM, merci d’avance pour ceux qui m’aideront :)

Exercice 1 :
1]. A = 4m x 7
A = 28m

B = 4m + 7m
B = 12m

C = 4m x 7m
C = 12m ²

D = 4 + 7m
(Tu ne peut la réduire)

E = 25a +5 -7k -5a +2k
E = 25a -5a -7k +2k +5
E = 20a -5k +5

F = 2R + 2R x R + (-R) x (-6)
F = 2R + 2R ² -R x (-6)
F = 2R + 2R ² +6R
F = 2R + 6R + 2R ²
F = 8R + 2R ²

G = 2 - ( 4 + 3y ) + ( 5y -6 )
G = 2 -4 -3y +5y -6
G = 2 -4 -6 -3y +5y
G = -8 +2y

H = ( 7 + u ) - (-u + 3)
H = 7 + u + u -3
H = 7 -3 + u + u
H = 4 + 2u

Exercice 2 :

I = -5 ( 3 -4u )
I = -5 x 3 -5 x (-4u)
I = -15 +20u

J = 2p ( -6 +3p )
J = 2p x (-6) +2p x 3p
J = -12p +6p ²

K = 4 + 6 ( -8m +2 )
K = 4 + 6 x (-8m) + 6 x 2
K = 4 -48m + 6x 2
K = 4 -48m + 12
K = 16 -48m

L = ( 2n -5 )( 3n +6 )
L = 2n x 3n + 2n x 6 -5 x 3n -5 x 6
L = 6n ² + 12n -15n -30
L = 6n ² -3n -30

M = ( 9y +1 ) ²
M = ( 9y +1)( 9y +1 )
M = 9y x 9y + 9y x 1 +1 x 9y +1 x 1
M = 81y ² +9y +9y +1
M = 81y ² +18y + 1

N = ( 5t -2 ) ²
N = ( 5t -2 )( 5t -2 )
N = 5t x 5t + 5t x (-2) -2 x 5t -2 x (-2)
N = 25t ² -10t -10t +4
N = 25t ² -20t + 4

P = ( 4d -2 )( 4d +2 )
P = 4d x 4d + 4d x 2 -2 x 4d -2 x 2
P = 16d ² + 8d -8d -4
P = 16d ² -4

Exercice 3 :

Q = 3t - 2t ²
Q = t ( 3 -2t)

R = 12a +8b -20
R = 4 ( 3a +2b -5)

S = ( t +4 )( 5 -t ) - ( 6 +3t )( t +4 )
Je suis désoler je n’est pas réussi celle là.