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Annie569
@Annie569
April 2019
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Bonjour j'ai besoin d'aide pour des mathématiques c'est assez urgent c'est pour ce matin .. Aidez moi au plus vite svp !! ( photo )
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nathalienouts
1)
A = (x-3)(4-x)+(x-3)(1-2x)
A = (4x-x²-12+3x)+(x-2x²-3+6x)
A = -x²+7x-12-2x²+7x-3
A = -3x²+14x-15
2)
A = (x-3)(4-x)+(x-3)(1-2x) on met x-3 en facteur
A = (x-3)(4-x+1-2x)
A = (x-3)(-3x+5)
3)
A = (x-3)(-3x+5) = 0
x-3 = 0 ou -3x+5 = 0
x = 3 ou -3x = -5
x = 3 ou x = 5/3
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A = (x-3)(4-x)+(x-3)(1-2x)
A = (4x-x²-12+3x)+(x-2x²-3+6x)
A = -x²+7x-12-2x²+7x-3
A = -3x²+14x-15
2)
A = (x-3)(4-x)+(x-3)(1-2x) on met x-3 en facteur
A = (x-3)(4-x+1-2x)
A = (x-3)(-3x+5)
3)
A = (x-3)(-3x+5) = 0
x-3 = 0 ou -3x+5 = 0
x = 3 ou -3x = -5
x = 3 ou x = 5/3