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minou67
@minou67
January 2021
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Bonjour jai un dm dé maths niveaux 4eme sites vis pouviez m'aider svp
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Verified answer
A = (2x+4)(x-3)
a. Réponse de Gil: A = 2x²-2x+12
pour Gil: A = 2(3)²-2*3+12 = 2*9-6+12 = 18+6 = 24
→ A = (2*3+4)(3-3) = (6+4)*0 = 0
b. A = (2x+4)(x-3)
A = 2x²-6x+4x-12
A = 2x²-2x-12
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minou67
sa veut dire quoi c'est signe "*"?
nai22
Ça veut dire fois
minou67
A merci
nai22
Pour commencer, dans le a tu dois refaire le calcul A mais en remplacent x par 3 ce qui donne A = (2×3+4)(3-3) = 0 puis tu fais la même chose mais avec le calcul de Gil ce qui donne A = 2×3▪2 - 2 × 3 + 12 = 24
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Verified answer
A = (2x+4)(x-3)a. Réponse de Gil: A = 2x²-2x+12
pour Gil: A = 2(3)²-2*3+12 = 2*9-6+12 = 18+6 = 24
→ A = (2*3+4)(3-3) = (6+4)*0 = 0
b. A = (2x+4)(x-3)
A = 2x²-6x+4x-12
A = 2x²-2x-12