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a = 2,7*10⁻¹º = 27*10⁻¹¹
b = 9*10⁻²º
a * b = 27·10⁻¹¹·9·10⁻²º = (27·9)·10⁻¹¹⁻²º = 243·10⁻³¹
a / b = 27·10⁻¹¹/ 9·10⁻²º =(27/9)·10⁻¹¹⁺²º = 3·10⁹
a/b= 3 × 10^9