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Sagot :

Réponse :

Bonjour,

D = (3x+2)² - (5-2x)(3x+2)

= 9x²+12x+4-(15x+10-6x²-4x)

= 9x²+12x+4-(11x+10-6x²)

= 9x²+12x+4-11x-10+6x²

= 15x² - 6 + x

:))

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