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            <video:description>Pour multiplier ou diviser des nombres en notation scientifique,  il suffit de regrouper les parties décimales entre elles et les puissances de dix entre elles puis de les calculer séparément. Par exemple,  (7 × 10^5) / (2 × 10^-2)(2,5 ×  10^9)= (7/2× 2,5)× (10^5/10^9)= 1,4×10^-2.</video:description>
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