bonjour je suis en 5éme pouvez vous m'aider pour l exercice 1 et 5 svp merci

Bonjour,

P = 5 x (a + 9)
P = 5 x a + 5 x 9
P = 5a + 45

L = 2 x (a - 4)
L = 2 x a - 2 x 4
L = 2a - 8

A = 3 x (10 + b)
A = 3 x 10 + 3 x b
A = 30 + 3b

U = 5 x (6 - b)
U = 5 x 6 - 5 x b
U = 30 - 5b

T = (11 + c) x 7
T = 11 x 7 + c x 7
T = 77 + 7c

N = (9,3 - c) x 7
N = 9,3 x 7 - c x 7
N = 65,1 - 7c

E = (d + 8a + b) x 8
E = d x 8 + 8a x 8 + b x 8
E = 8d + 64a + 8b

S = (d - 2g + 3c) x 10
S = d x 10 - 2g x 10 + 3c x 10
S = 10d - 20g + 30c

B)

A = 3 x (a + 5) = 3a + 15
B = 2 x (7 + 3b) = 14 + 6b
C = 4 x (8 + b + c) = 32 + 4b + 4c
D = (a - 4 + 2y) x 5 = 5a - 20 + 10y

Exercice 5 :

F = 8(5 + x) + 3
F = 8 * 5 + 8 * x + 3
F = 40 + 3 + 8x
F = 43 + 8x

K = 7(4 - b) + 9
K = 7 x 4 - 7 x b + 9
K = 28 + 9 - 7b
K = 37 - 7b

M = (4 - b) x 7 + 4,3b - 5
M = 4 x 7 - b x 7 + 4,3b - 5
M = 28 - 5 - 7b + 4,3b
M = 23 - 2,7b