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Roxanevivier30
@Roxanevivier30
May 2019
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Bonsoir vous pouvez m'aider svp a cette exo car j'arrive pas du tout et c'est très important merci (3eme)
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marco31
1/
ABCD est un carre donc AB=BC=4cm donc AH=AB-BH=4-x
2/
(4-x)²-2²=(4-x)-4
3/
Q=(4-x)²-4= 4²-2×4x+x²-4=16-8x+x²-4=12-8x+x²⇒x²-8x+12
4/
Q=(4-x)²-2²=[(4-x)+2] [(4-x)-2]=(6-x) (2-x)
Q=(6-2) (2-2)=0
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marco31
5/ Quand x=2 les points Eet H se confonde ainsi que les points F et I , et G et J donc il n ya plus de zone a chuté.
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Lista de comentários
ABCD est un carre donc AB=BC=4cm donc AH=AB-BH=4-x
2/
(4-x)²-2²=(4-x)-4
3/
Q=(4-x)²-4= 4²-2×4x+x²-4=16-8x+x²-4=12-8x+x²⇒x²-8x+12
4/
Q=(4-x)²-2²=[(4-x)+2] [(4-x)-2]=(6-x) (2-x)
Q=(6-2) (2-2)=0