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Forfatter(e) Philippe Delsarte, Manon Oreins
Frist Ingen frist
Innleveringsgrense Ingen begrensning
Kategorimerkelapper suite

Merkelapper

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Suites - Q19

On s’intéresse à la suite (xn)n≥1 définie par x1=2 et xn=2xn−1−1 (pour n≥2).

Spørsmål 1:
Hint Add answer

Obtenir une formule explicite pour le n ième terme, xn

  • General
  • Symbols
  • Geometry
$\frac{\square}{\square}$⬜⬜​​$\sqrt{\square}$√⬜​$\sqrt[3]{\square}$3√⬜​$\sqrt[\square]{\square}$⬜√⬜​$\int_{\square}^{\square}$∫⬜⬜​​$\square^2$⬜2​$\square_2$⬜2​​$\left(\square\right)$(⬜)​
$\times$×​$\div$÷​$\pm$±​$\pi$π​$\infty$∞​$\varnothing$∅​$\ne$≠​$\ge$≥​$\le$≤​$>$>​$<$<​$\cup$∪​$\cap$∩​
$\angle$∠​$\parallel$∥​$\perp$⊥​$\triangle$△​$\parallelogram$▱​
Spørsmål 2:
Hint Add answer

Calculer la somme des dix premiers termes, S10=x1+⋯+x10.

  • General
  • Symbols
  • Geometry
$\frac{\square}{\square}$⬜⬜​​$\sqrt{\square}$√⬜​$\sqrt[3]{\square}$3√⬜​$\sqrt[\square]{\square}$⬜√⬜​$\int_{\square}^{\square}$∫⬜⬜​​$\square^2$⬜2​$\square_2$⬜2​​$\left(\square\right)$(⬜)​
$\times$×​$\div$÷​$\pm$±​$\pi$π​$\infty$∞​$\varnothing$∅​$\ne$≠​$\ge$≥​$\le$≤​$>$>​$<$<​$\cup$∪​$\cap$∩​
$\angle$∠​$\parallel$∥​$\perp$⊥​$\triangle$△​$\parallelogram$▱​