Math Problem Statement
On étudie la suite (an) dite de Fibonacci définie par : a0 = 0 , a1 = 1 et, pour tout n dans N : an+2 = an+1 + an . A) 1°) Montrer que, pour tout n de N*, an N* . 2°) Montrer que la suite (an) est strictement croissante à partir du rang 2. 3°) Montrer que, pour tout n de N, an n – 1 . 4°) Donner la limite de (an) lorsque n tend vers +. B) 1°) Après avoir conjecturer sur les premiers indices, établir, pour tout n de N*,une expression plus simple de : a) un = (an) 2 – an+1 an-1 .
Solution
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Math Problem Analysis
Mathematical Concepts
Sequences and Series
Fibonacci Sequence
Recurrence Relations
Formulas
Fibonacci recurrence relation: a_{n+2} = a_{n+1} + a_n
Growth estimation of Fibonacci sequence: a_n ≈ φ^n / √5 where φ is the golden ratio
Theorems
Proof by mathematical induction
Properties of Fibonacci sequence
Monotonicity of sequences
Suitable Grade Level
Grades 11-12
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