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Lynkss
@Lynkss
January 2021
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Bonjour j'ai un DM a rendre pour vendredi et je ne comprend pas.l'énoncé du 1er exercice pouvez vous m'aidez?
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loulakar
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Il suffit simplement de remplacer a et b dans les expressions :
A = (a + b)^2 - (a - b)^2
1) calcul A pour a = 1 et b = 5
A = (1 + 5)^2 - (1 - 5)^2
A = 6^2 - (-4)^2
A = 36 - 16
A = 20
2) calcul A pour a = -2 et b = -3
A = (-2 - 3)^2 - (-2 + 3)^2
A = (-5)^2 - (1)^2
A = 25 - 1
A = 24
3) A = 4 * ab ?
A = (a + b)^2 - (a - b)^2
A = (a + b - a + b)(a + b + a - b)
A = 2b * 2a
A = 4 ab
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Verified answer
Il suffit simplement de remplacer a et b dans les expressions :A = (a + b)^2 - (a - b)^2
1) calcul A pour a = 1 et b = 5
A = (1 + 5)^2 - (1 - 5)^2
A = 6^2 - (-4)^2
A = 36 - 16
A = 20
2) calcul A pour a = -2 et b = -3
A = (-2 - 3)^2 - (-2 + 3)^2
A = (-5)^2 - (1)^2
A = 25 - 1
A = 24
3) A = 4 * ab ?
A = (a + b)^2 - (a - b)^2
A = (a + b - a + b)(a + b + a - b)
A = 2b * 2a
A = 4 ab