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lunarose
@lunarose
October 2023
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Pour tout nombre entier n supérieur ou égal à 1, on pose: Sn = 1/1*2 + 1/2*3 + … + 1/n(n+1)
a) Calculer S1, S2 et S3.
b) Démontrer que la suite (Sn) est croissante en N(entier naturel).
c) Pour tout nombre entier k supérieur ou égal à 1, justifier que : 1/k(k+1) = 1/k - 1/k+1.
d) En déduire une expression simple de Sn.
1ère spé maths
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