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Bonjour je ne comprends pas la résolution de cet item:

A l'instant t=0, on dispose d'une source de 1500 MBq de Rubidium 82, correspondant à l'activité administrée pour un examen.

A) A t=7,6s, il reste entre 95% et 97% de l'activité initiale

je ne comprends pas le calcul à faire..

 

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