February 2021 0 62 Report
Aidez moi svp la lumiere parcour 300 000 000 métre par seconde (m/s) . Une année est constitué environ de 32 000 000 seconde .

1/ exprimer ces 2 quantité en ecriture scientifique
2/ calculer une année lumiére c'est a dire la distanceque parcourt la lumiere en une année
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