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Réponse :
Bonjour
Explications étape par étape
G = (x +4)(x +1)
G = x² +x +4x +4
G = x² +5x +4
H = (x +7)(4x +2)
H = (4x² +2x +28x +14
H = 4x² +30x +14
I = (2x +1) (2x -1)
I = 4x² -2x +2x -1
I = 4x² -1
J = (2x -6)(y +3)
J = 2xy +6x -6y -18
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