29) (1/10)⁻⁵ : (1/10)⁻⁷ =

\(\left(\frac{1}{10}\right)^{-5}:\left(\frac{1}{10}\right)^{-7}=\left(\frac{1}{10}\right)^{-5-(-7)}=\left(\frac{1}{10}\right)^2=\frac{1}{100}\).

Ответ: \(\frac{1}{100}\).