Question

Potencia de base 10
1,2.10^-3+3.10^-3

Answer 1

As potências das bases são as mesma, então é só somar mantendo as bases, logo 4,2.10^-3

Answer 2

Vamos começar:
$1,2. 10^{-3}+ 3. 10^{-3} \\ \\ 1,2 = \frac{12}{10} \\ 10^{-3} = \frac{1}{ 10^{3} } \\ \\ \frac{12}{10} \frac{1}{ 10^{3} } = \frac{12}{ 10^{4} } \\ \\ \frac{12}{ 10^{4} } + \frac{3}{ 10^{3} } \\ \\ MMC= 10^{4} \\ \\ \frac{12+3.10}{ 10^{4} } = \frac{12+30}{ 10^{4} } = \frac{42}{ 10^{4} }$