Ivan Shishkin, Rye (1878)

Problems/ArithmeticExerciseUnreviewed

Exemple d’entiers premiers entre eux ?

by Ancient Tree·
15
Difficulty scaleÉchelle de difficulté

This score reflects both the level of the required concepts and the difficulty of the solution.Ce score tient compte à la fois du niveau des notions nécessaires et de la difficulté de la résolution.

  1. 1–10First steps / middle schoolPremiers pas / collège
  2. 11–25Beginner / high schoolDébutant / lycée
  3. 26–50Intermediate / undergraduateIntermédiaire / licence
  4. 51–70Advanced / graduateAvancé / master
  5. 71–90Expert / specializedExpert / spécialisé
  6. 91–100Research levelNiveau recherche
These levels are approximate guides.Ces niveaux sont des repères approximatifs.
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Est-ce que 99 et 1515 sont premiers entre eux ?

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Solution by Ancient Tree

Discussions0 useful votes

99 et 1515 ne sont pas premiers entre eux, car ce sont tous les deux des multiples de 3 :
9=3×3,15=3×5.9=3\times 3,\quad 15=3\times 5.Dit autrement, 33 est un diviseur commun à 99 et à 1515.

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