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Bonjour,

2)

C = 2 (x + 6)

C = 2x + 12

D = (x + 7) (3x + 4)

D = 3x² + 4x + 21x + 28

D = 3x² + 25x + 28

E = (3 - 2x) (x - 1)

E = 3x - 3 - 2x² + 2x

E = - 2x² + 5x - 3

F = 9 (x + 2) + (x + 3) (x - 4)

F = 9x + 18 + x² - 4x + 3x - 12

F = x² + 8x + 6

G = 3 (7x + 6) - (21x + 19)

G = 21x + 18 - 21x - 19

G = - 1.

3) On ne le voit pas...