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Sagot :

NBA10

Réponse :

bonjour,

(-1/4 + 2x ) ( -2/5 - x )

= -1/4×-2/5 - (-1/4) × x +2x ×(-2/5) +2x ×(-x)

= 2/20 + 1/4 x - 4/5 x - 2x²

= 2/20 + 1×5/4×5 x - 4×4/5×4 x - 2x²

= 2/20 + 5/20 x - 16/20 x - 2x²

= 2/20 - 11/20 x - 2x²

= - 2x² - 11/20 x + 1/10

voila :)

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