u n 2 )= 3un 1 )- 2un


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PDF 1 Soit u une suite définie sur IN par u0 = 1 et un + 1 = 2un 2 + 3un 1

vn = 1 un ⇔ un = 1 vn = 2 3n + 2 comme conjecturé précédemment 4/ Etudier la monotonie de u un + 1 – un = 2 3(n + 1)+ 2

PDF Chapter 15 Difference Equations 2 15 DIFFERENCE

1 If un =2un−1 +un−2 and u1 =2 u2 =5 find the values of u3 u4 u5 2 un =pun−1 +qun−2 describes the sequence 1 2 8 20 68 Find p and q 3 If Fn is a term of the Fibonacci sequence investigate the value of Fn+1 Fn−1 −Fn 2 4 What sequences correspond to the difference equation un =un−1 −un−2 n ≥3? Choose your own

PDF Edexcel

The sequence of positive numbers u 1 u 2 u 3 is given by u n + 1 = (u n – 3)2 u 1 = 1 (a) Find u 2 u 3 and u 4 (3) (b) Write down the value of u 20 (1) (C1 Q2 Jan 2006) 2 A sequence a 1 a 2 a 3 is defined by a 1 = 3 a n + 1 = 3a n – 5 n 1 (a) Find the value a 2 and the value of a 3 (2) (b) Calculate the value of

PDF Feuille dexercices no 9 : Suites numériques

14 déc 2022 · 1 u0 = 1 et ∀n ∈ N un+1 = 4un − 6 2 u0 = 0 u1 = 1 et ∀n ∈ N un+2 = 3un+1 − 2un 3 u0 = 0 u1 = 1 et ∀n ∈ N un+2 = 6un+1 − 9un

PDF Feuille dexercices n°1 : Suites réelles

Exercice 23 ( ) Soit (un)n∈N la suite définie par u0 = 1 2 et un+1 = 2un un + 1 pour tout n ∈ N a Démontrer que la suite (un) est bien définie ( 

PDF S Polynésie juin 2013

Conclusion Le principe de récurrence nous permet d'affirmer que pour tout entier naturel n : 0 < un 2 a Pour tout entier naturel n un+1−un= 3un 1+2un −

PDF Suites

∀n ⩾ 2 un = 3un−1 −2un−2 +n3 6 ∀n ∈ N un+3 −6un+2 +11un+1 −6un +γ−1+o(1)=lnn+γ−1+o(1) Enfin n ∑ k=1 1 2k+1 = −1+ 2n+1 ∑ k=1 1 k −

  • Comment calculer u1 u2 u3 ?

    Pour calculer u1, on fait n = 0 dans (*) : u1 = 2u0 − 1 = 2 χ 3 − 1 = 5.
    Pour calculer u2, on fait n = 1 dans (*) : u2 = 2u1 − 1 = 2 χ 5 − 1 = 9.
    De même : u3 = 2u2 − 1 = 17.
    On remarque que, pour calculer un terme de la suite, on doit calculer tous les termes d'indice inférieur.

  • Comment exprimer la somme en fonction de n ?

    Forme explicite : si la suite (un) est arithmétique de raison r et de premier terme u0, alors pour tout entier naturel n, un = u0 +nr.
    Plus généralement, pour tous entiers naturels n et p, un = up +(n −p)r.
    Somme des n premiers termes d'une suite arithmétique : S = u0 +u1 +···+un = (n +1)(u0 +un) 2 .

  • Comment déterminer la nature de la suite ?

    Une suite géométrique est une suite telle que chaque terme se déduit du précédent par la multiplication par un réel constant (également appelé la raison de la suite).
    Pour montrer qu'une suite (Vn) est géométrique, on montre qu'il existe un réel q constant tel que, pour tout entier n, V_{n + 1} = q \\times V_n.

  • Attention la somme S = u0 + u1 + u2 + Λ + un est une somme de (n + 1) termes. (un) désigne une suite arithmétique de raison r, Sn = u0 + u1 + Λ + un .
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on considere la suite (un) definie par u0=0 et pour tout entier naturel n un+1=3un-2n+3 démontrer par récurrence que pour tout entier naturel n un 1 a le même signe que (- 1 n on considere la suite un definie par u0 2 et un 1 un 2 2un 1 exprimer vn puis un en fonction de n trouver un a partir de un+1 comment démontrer qu'une suite est géométrique asie 2013 maths

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