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Gugo671
@Gugo671
May 2019
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Bonjour est ce que une personne pourrait m’aider à faire mon exercice 4 svp je n’arrive pas du tout. Devoir maison 3 eme.
Merci d’avance
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1) 0 < x < 6/2 donc 0 < x < 3
2) aire de la croix = 6² - 4×2,4² = 12,96
3) aire de la croix = aire du grand carré - aires des 4 petits carrés blancs
= 6² - 4x²
4) 6² - 4x² = 6² - (2x)² = (6+2x)(6-2x) car a²-b² = (a+b)(a-b)
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Gugo671
Merci
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Verified answer
1) 0 < x < 6/2 donc 0 < x < 32) aire de la croix = 6² - 4×2,4² = 12,96
3) aire de la croix = aire du grand carré - aires des 4 petits carrés blancs
= 6² - 4x²
4) 6² - 4x² = 6² - (2x)² = (6+2x)(6-2x) car a²-b² = (a+b)(a-b)