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Sarah67tkt
@Sarah67tkt
May 2019
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Bonjour, je suis en 2nde et jaurai besoin daide pour mon dm de math svp
mershi davance
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no63
Salut
1) x appartient a [ 0 ; 4 ]
2) Aire(ABCD) = x²
Aire(BEFG)= (4-x)²= x²-8x+16
Aire(ABCD)+Aire(BEFG)= 2x²-8x+16
3) a) 2-2x=0 => x=1
x-3=0 => x=3
tableau
x 0 1 3 4
2-2x + 0 - -
3-x + + 0 -
expr + 0 - 0 +
b) (2-2x)(3-x)= 2x²-8x+16
4) d'après le tableau de signe Aire>10 pour appartenant a
] 0 ; 1 [ U ] 3 ; 4 [
1 votes
Thanks 1
sarah67tkt
Daccord, pas de soucis
sarah67tkt
Du coup la 3b? Et cela change t il le resultat ou l'interpretation de la suite?
sarah67tkt
Et comment a tu fait pour la toute derniere question?
sarah67tkt
La 4
sarah67tkt
Ahh non cest bon jai compris
sarah67tkt
Mercii beaucoup
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1) x appartient a [ 0 ; 4 ]
2) Aire(ABCD) = x²
Aire(BEFG)= (4-x)²= x²-8x+16
Aire(ABCD)+Aire(BEFG)= 2x²-8x+16
3) a) 2-2x=0 => x=1
x-3=0 => x=3
tableau
x 0 1 3 4
2-2x + 0 - -
3-x + + 0 -
expr + 0 - 0 +
b) (2-2x)(3-x)= 2x²-8x+16
4) d'après le tableau de signe Aire>10 pour appartenant a
] 0 ; 1 [ U ] 3 ; 4 [