Quelqu'un peut il m'aider sur ces exercices sur les developpements.

Exercice 1

A = x + 7x - 4x + 2x
A = x + 7x + 2x - 4x
A = 10x - 4x
A = 6x

B = 2y - 0,5y + 3,3y
B = 2y + 3,3y - 0,5y
B = 5,3y - 0,5y
B = 4,8y

C = - 2a + 3b + 5a - 1,2b
C = - 2a + 5a + 3b - 1,2b
C = 3a + 1,8b

Exercice 2

A = 2 (x + 8) - (x + 6)
A = 2x + 16 - x + 6
A = 2x - x + 16 + 6
A = x + 22

B = 5 (x - 1) + 3 (x + 1)
B = 5x - 5 + 3x + 3
B = 5x + 3x - 5 + 3
B = 8x - 2

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

D = 3 (a - b) - 2 (a + b) + 4b
D = 3a - 3b - 2a - 2b + 4b
D = 3a - 2a - 3b - 2b + 4b
D = a - b

E = 3b + 5 (a + b) - 4 (2b - a)
E = 3b + 5a + 5b - 8b + 4a
E = 5a + 4a + 3b + 5b - 8b
E = 9a

F = 3 (a - b + c) - 7 (a - b) + 4 (a - c - b)
F = 3a - 3b + 3c - 7a + 7b + 4a - 4c - 4b
F = 3a + 4a - 7a - 3b - 4b + 7b + 3c - 4c
F = - c

G = 3 (1/5 + x) + 1/2 (2x - 1/5)
G = 3/5 + 3x + 2/2x - 1/10
G = 6/10 + 30/10x + 5/10x - 1/10
G = 6 + 30x + 5x - 1
G = 30x + 5x + 6 - 1
G = 35x + 5

H = x/10 (1 - x/10) + x²/100
H = x/10 - x²/100 + x²/100
H = x/10