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Laurie14
@Laurie14
May 2019
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Bjr pourriez vous m'aidez à mon devoir maison en math qui est pour demain merci d'avance
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1) Méthode 1 : aire ABIH + aire IDEF
a × (b - 2) + 5 × 2
Méthode 2 : aire ACEG - (aire HIFG + BCDI)
b × (a + 5) - [ 2a + 5 ×(b-2)]
2) a × (b - 2) + 5
× 2
= ab - 2a + 10
b × (a + 5) - [2a
+ 5
×(
b-2)]
= ab + 5b - (2a + 5b - 10)
= ab - 2a + 10
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a × (b - 2) + 5 × 2
Méthode 2 : aire ACEG - (aire HIFG + BCDI)
b × (a + 5) - [ 2a + 5 ×(b-2)]
2) a × (b - 2) + 5 × 2
= ab - 2a + 10
b × (a + 5) - [2a + 5×(b-2)]
= ab + 5b - (2a + 5b - 10)
= ab - 2a + 10