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Kacirabiha
@Kacirabiha
May 2019
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Bonjour, j’aimerais une réponse pour l’exercice 5. Merci
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trudelmichel
Bonjour,
Aire ABCD=côté²
Aire ABCD=40²
aire ABCD=1600
EFGD
ED=AD+15
ED=40+15=35
EF=AB+25
EF=40+25=65
Aire AFGD=(35)(65)
Aire EFGD=2275
2) AB=x
ED=x-15
EF=x+25
Aire ABC=x²
Aire EFGD=(x-15)(x+25)
Aire EFGD= x²-15x+25x-375
Aire EFGD=x²+10x-375
Aire ABCD=Aire EFGD
x²=x²+10x-375
0=(x²+10x-375)-x²
0=x²+10x-375-x²
0=10x-375
10x=375
x=375/10
x=37.5
si AB=37.5 cm
les aires ABCD et EFGD sont égales
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Lista de comentários
Aire ABCD=côté²
Aire ABCD=40²
aire ABCD=1600
EFGD
ED=AD+15
ED=40+15=35
EF=AB+25
EF=40+25=65
Aire AFGD=(35)(65)
Aire EFGD=2275
2) AB=x
ED=x-15
EF=x+25
Aire ABC=x²
Aire EFGD=(x-15)(x+25)
Aire EFGD= x²-15x+25x-375
Aire EFGD=x²+10x-375
Aire ABCD=Aire EFGD
x²=x²+10x-375
0=(x²+10x-375)-x²
0=x²+10x-375-x²
0=10x-375
10x=375
x=375/10
x=37.5
si AB=37.5 cm
les aires ABCD et EFGD sont égales