Antécédent par un programme de calcul

Voici un programme de calcul.

Quel nombre de départ faut-il choisir pour que le résultat du programme de calcul soit ?

carré racine carrée
Pour t'aider, tu peux modifier le nombre de départ (case jaune) et cliquer sur Calcule.
L'antécédent à choisir est :


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