bonjour j ai besoin daide sur un calcul de developpement svp (-5L-4sur7)au carrer

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Grade: Education Subject: mathematiques
bonjour j ai besoin daide sur un calcul de developpement svp (-5L-4sur7)au carrer
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Bonjour,

(- 5l - 4/7)²
= - 25l² - 40/14l + 16/49