Bonjour pouvez-vous m’aider svp c’est un exercice de 4ème a)indique les puissances de 10qui correspondent aux chiffres repérés par les flèches:

3 956 000 000

.... .... .... ....

=3956X............=3956X.....

=395,6X..........=395,6X.....

=3,956X..........=3,956X.....


b)on étudie le nombre 0,000 005 21

.... ....
=5,21X...
=521X...


Merci d’avance
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