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Nancy1001
@Nancy1001
January 2021
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Hey,
Pourriez-vous m'aider aux 2 exercices suivants ?
Merci !
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loulakar
Verified answer
Bonsoir,
Si je soustrais 10 à un nombre son carré est diminué de 1000.
N : nombre
(N - 10)^2 = N^2 - 1000
N^2 - 20N + 100 = N^2 - 1000
20N = 1000 + 100
20N = 1100
N = 1100/20
N = 55
Vérification :
55 - 10 = 45
45^2 = 2025
55^2 = 3025
3025 - 2025 = 1000
5) aire du carré a) :
Ac = (x + 1)(x + 1) - 1 * 1
Ac = (x + 1 - 1)(x + 1 + 1)
Ac = x(x + 2)
Aire du rectangle b) :
Ar = x(x + 2)
Donc Ac = Ar
0 votes
Thanks 1
Nancy1001
Bonsoir, je te remercie énormément, bonne soirée.
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Hey, Quelqu'un pourrais m'aider pour l'exercice 2 et 3 ? Merci beaucoup :) ENONCE :
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Lista de comentários
Verified answer
Bonsoir,Si je soustrais 10 à un nombre son carré est diminué de 1000.
N : nombre
(N - 10)^2 = N^2 - 1000
N^2 - 20N + 100 = N^2 - 1000
20N = 1000 + 100
20N = 1100
N = 1100/20
N = 55
Vérification :
55 - 10 = 45
45^2 = 2025
55^2 = 3025
3025 - 2025 = 1000
5) aire du carré a) :
Ac = (x + 1)(x + 1) - 1 * 1
Ac = (x + 1 - 1)(x + 1 + 1)
Ac = x(x + 2)
Aire du rectangle b) :
Ar = x(x + 2)
Donc Ac = Ar