57
A = 6x + x + 5x
A = 12x
B = 7x - x + 2x
B = 6x + 2x
B = 8 x
C = 8x + 3x - x - 4 + 10
C = 11x - x + 6
C = 10x + 6
D = x + 3 + x + 3
D = 2x + 6
E = 7x - 6x + 5 + 3
E = x + 8
F = 9x - 9x + 2 + 7
F = 9
58 :
A = 3 * (a+5) + 2a
A = 3a + 15 + 2a
A = 5a + 15
B = 8a + 4*(a+3)
B = 8a + 4a + 12
B = 12a + 12
C = 7 + 3*(a+1)
C = 7 + 3a + 3
C = 3a + 10
D = (a+4) * 5 + 8
D = 5a + 20 + 8
D = 5a + 28
J'espère t'avoir aider :)