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Math30000
@Math30000
June 2021
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HELP, BLOCAGE SUR UNE QUESTION DE MATHÉMATIQUES ( 3ème )
L'affirmation est-elle vraie ou fausse ? Justifier.
Pour tous les nombres n, (n+1)² - (n-1)² est un multiple de 4.
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danielwenin
Verified answer
(n+1)² - (n-1)² = 4n et n entier donc c'est un multiple de 4.
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ficanas06
Verified answer
(n+1)² - (n-1)² est du type a²-b²=(a+b)(a-b) identité remarquable
(n+1+n-1)(n+1-n+1)=2n * 2= 4n multiple de 4
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Verified answer
(n+1)² - (n-1)² = 4n et n entier donc c'est un multiple de 4.Verified answer
(n+1)² - (n-1)² est du type a²-b²=(a+b)(a-b) identité remarquable(n+1+n-1)(n+1-n+1)=2n * 2= 4n multiple de 4