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Sagot :

TALAMASADONAI

Réponse :Bonjour,

3*10^2 * 1.2 * 10^-9    / 15*10^2

=3* 1.2 * 10 ^(2-9)   / 15* 10^2

= (3.6/15) * (10^-7 / 10 ^2)

= 3.6/15 *    10^(-7-2)

= 3.6/15 * 10^-9

= 0.24 * 10^-9

= 2.4 * 10^-10

Bon courage.

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