Cho \(A = \frac{{0,00015}}{...

C

- Hướng dẫn giải

Ta có:

\(\begin{array}{l}0,00015 = {15.10^{ - 5}}\\0,0000035 = {35.10^{ - 7}}\end{array}\)

Nên \(A = \frac{{0,00015}}{{0,0000035}} = \frac{{{{15.10}^{ - 5}}}}{{{{35.10}^{ - 7}}}} = \frac{{15}}{{353}}.\left( {{{10}^{ - 5}}{{.10}^7}} \right) = \frac{3}{7}{.10^2} = \frac{{300}}{7}\)