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R972
@R972
May 2019
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Bonjour je suis en 3eme et je bloque sur un exercice pour mon DM
Aux quatre coins d'un carré de 4cm de côté ,on a enlevé 4 carré de coté x.Calculer x pour que l'aire de la croix soit moitié de celle du carré ABCD
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Bonjour
aire carré initial = 4 ² = 16 cm²
aire des 4 carrés de côté x = 4 x²
surface restante = 16 - 4 x²
16 - 4 x² = 16 /2
16 - 4 x² = 8
- 4 x² = 8 - 16
- 4 x² = - 8
x² = 2
x = √ 2
aire des 4 carrés = 4 (√2) ² = 8
16 - 8 = 8
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aire carré initial = 4 ² = 16 cm²
aire des 4 carrés de côté x = 4 x²
surface restante = 16 - 4 x²
16 - 4 x² = 16 /2
16 - 4 x² = 8
- 4 x² = 8 - 16
- 4 x² = - 8
x² = 2
x = √ 2
aire des 4 carrés = 4 (√2) ² = 8
16 - 8 = 8