Question

Qual a simplificaçao da expressao


12.10⁻³ . 10⁻⁴ . 10⁹
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3.10 ⁻¹ . 10⁴

Answer 1

$\dfrac{12\cdot10^{-3}\cdot10^{-4}\cdot10^{9}}{3\cdot10^{-1}\cdot10^{4}}=\dfrac{12\cdot10^{-3-4+9}}{3\cdot10^{-1+4}}=\dfrac{12\cdot10^{2}}{3\cdot10^{3}}=4\cdot10^{-1}=0,4$

Answer 2

$\frac{12.10^-^1.10^-^4.10^9}{3.10^-^1.10^4} =$

$\frac{12. 10^{-3-4+9} }{3. 10^{-1+4} } =$

$\frac{12.10^2}{3.10^3} = 4. 10^{2-3} =4.10^-^1= \frac{4}{10} =0,4$