Ivan Shishkin, Rye (1878)

Problems/Real analysisUnreviewed

une petite étude de fonction très sympa

by mathman·
40
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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Pour xx réel ⩾0\geqslant 0, on définit f(x)=xe−x\displaystyle f(x)=xe^{-x}

Après une étude rapide des variations de la fonction ff sur R+\mathbb {R+},

Montrez que pour 0<x<10<x<1 , on a f(x)>f(1x)\displaystyle f(x)>f(\frac{1}{x})

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