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AZAXTRA

1) 2(6)² -3(6) - 9 = 72 - 18 - 9 = 45


2) -1.5 et 3

 

3) Aire = (x-3)(2x+3) = 2x² - 3x - 9
     Aire = 5 entraine x = 3.5 (car x > 3) (la ligne 15 du tableur)