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'''Exercice n°1  (suite réelle & valeur absolue''')

Exprimer <math>U_{n}</math> en fonction de n, sachant que :
<math>U_{n+1}</math>=<math>|U_{n}|</math>- (<math> 1/2 </math>)<math>U_{n}</math> 
et <math>U_{0}</math>  est un réel non nul.

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