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delphinecalon
@delphinecalon
January 2021
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Bonjour besoin d'aide pour ex 2 merci beaucoup
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Moananui
Bonjour,
Aire d'un rectangle A = Longueur * largeur
A = 4*(3x - 2) = 4*3x - 4*2 = 12x - 8
Aire d'un triangle A' = Base * hauteur / 2
A' = 2x * 2 / 2 = 2x
Les deux aires sont égales si
A = A'
12x - 8 = 2x
12x = 2x + 8
12x - 2x = 8
10x = 8
x = 8/10
x = 0,8
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Aire d'un rectangle A = Longueur * largeur
A = 4*(3x - 2) = 4*3x - 4*2 = 12x - 8
Aire d'un triangle A' = Base * hauteur / 2
A' = 2x * 2 / 2 = 2x
Les deux aires sont égales si
A = A'
12x - 8 = 2x
12x = 2x + 8
12x - 2x = 8
10x = 8
x = 8/10
x = 0,8