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Mariecoeur
@Mariecoeur
April 2019
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Aidez moi s'il vous plaît:
On donne l'expression :
A = 25x^2-40x+16-(5x-4)(2x+3)
Utiliser la forme la plus rapide pour calculer A pour x = 7: 3 (cest une fraction)
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cavalier
A = 25x²-40x+16-(5x-4)(2x+3)
=(5x-4)² -(5x-4)(2x+3)
=(5x-4)(5x-4-2x-3)
=(5x-4)(3x-7)
pour x=7/3
A= (5X7/3 -4) (3X7/3-7)
=(35/3-4)(21/3-7)
=(35/3-12/3)(21/3-21/3)
=23/3 X 0
=0
2 votes
Thanks 1
cavalier
n'hésite pas à noter meilleure réponse, merci
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=(5x-4)² -(5x-4)(2x+3)
=(5x-4)(5x-4-2x-3)
=(5x-4)(3x-7)
pour x=7/3
A= (5X7/3 -4) (3X7/3-7)
=(35/3-4)(21/3-7)
=(35/3-12/3)(21/3-21/3)
=23/3 X 0
=0