63×10³×0,8×10(puissance 7) / (c'est une division) 2,88×(10 ( puissance -5) )³

63*0.8*10³*10⁷ = 50.4*10¹⁰
 2.88 * (10⁻⁵)³ = 2.88 * 10⁻¹⁵

(50.4*10¹⁰) / (2.88*10⁻¹⁵) = (50.4/2.88) * (10¹⁰/10⁻¹⁵) = 17.5 * 10²⁵ = 1.75 * 10²⁶