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Sagot :

VINS

bonjour

(-3x+5-4y)(-5x-8-4y)​

⇔  15 x² + 24 x + 12 xy - 25 x - 40 - 20 y + 20 xy + 32 y + 16 y²

⇔  15 x² + 16 y² - x + 12 y + 32 xy - 40  

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