Réponse :
ex2 calculer les expressions suivantes et donner l'écriture scientifique
A = (0.28 x 10⁴ x 24 x 10⁴)/(1680 x (10⁹)⁵)
= (28 x 10² x 24 x 10⁴)/(1680 x 10⁴⁵)
= (672 x 10⁶)/(1680 x 10⁴⁵)
= 0.4 x 10⁶/10⁴⁵ = 4 x 10⁵ x 10⁻⁴⁵ = 4 x 10⁻⁴⁰
B = (150 x 10¹ x 0.45 x 10⁻⁷)/(150 x (10⁻⁵)³
= ( 45 x 10⁻⁸)/10⁻¹⁵ = 45 x 10⁻⁸ x 10¹⁵ = 45 x 10⁷ = 4.5 x 10⁸
C = (0.15 x 10⁻¹ x 0.1 x 10⁷)/(24 x (10⁻⁶)⁵)
= (15 x 10⁻⁴ x 10⁷)/(24 x 10⁻³⁰)
= 0.625 x 10³/10⁻³⁰ = 625 x 10³⁰ = 6.25 x 10³²
Explications étape par étape
