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lolitacrp
@lolitacrp
January 2021
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3ème: Mathématiques
Bonjour, j'aimerai avoir de l'aide pour l'exercice 5, je vous ai mis la pièce jointe! Merci
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Christine17
1)
avec x=6
2x²-3x-9=
72-18-9=45
si on met 6 en A17 on aura 45 en B17
2)équation=0 donc B=0
pour x=-1,5 et x=3
3)
aire du rectangle=Lxl=(2x+3)(x-3)
=2x²-6x+3x-9
=2x²-3x-9
aire=5cm²
pour x=3,5
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avec x=6
2x²-3x-9=
72-18-9=45
si on met 6 en A17 on aura 45 en B17
2)équation=0 donc B=0
pour x=-1,5 et x=3
3)
aire du rectangle=Lxl=(2x+3)(x-3)
=2x²-6x+3x-9
=2x²-3x-9
aire=5cm²
pour x=3,5