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Lidoboss
@Lidoboss
May 2019
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Bonjour j’ai besoin de toute urgence qu’on me fasse mon exo. Je vous remercie d’avance.
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no63
Salut
1) x appartient a [ 0 ; 15 ]
2) MN= AB-x
= 15-x
3) thales
MB/AB=MN/AC
x/15=MN/5
15*MN=5x
MN=(5/15)x => MN= (1/3)x
4) Aire= L*l
=> (x/3)(15-x)
=> (15x-x²)/3
=> 5x-(1/3)x²
5) le maxi est donné par -b/2a
=>x= -5/(2*-1/3)
=>x= -5/(-2/3)
=>x= 7.5
6)le maximum est atteint pour x=7.5
valeur du maxi 18.75
2 votes
Thanks 2
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lidoboss
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Bonjour j'ai besoin que vous me fassiez cet exercice (ex37) avec des justifications. Merci d'avance. (Niveau Seconde)
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Lista de comentários
1) x appartient a [ 0 ; 15 ]
2) MN= AB-x
= 15-x
3) thales
MB/AB=MN/AC
x/15=MN/5
15*MN=5x
MN=(5/15)x => MN= (1/3)x
4) Aire= L*l
=> (x/3)(15-x)
=> (15x-x²)/3
=> 5x-(1/3)x²
5) le maxi est donné par -b/2a
=>x= -5/(2*-1/3)
=>x= -5/(-2/3)
=>x= 7.5
6)le maximum est atteint pour x=7.5
valeur du maxi 18.75