Ответ:
\[\frac{5}{18}\cdot\frac{6}{25}=\frac{30}{450}=\frac{1}{15}.\]
\[\frac{8}{30}-\frac{1}{15}=\frac{4}{15}-\frac{1}{15}=\frac{1}{5}.\]
Ответ: \(\frac{1}{5}\).
\[\frac{5}{18}\cdot\frac{6}{25}=\frac{30}{450}=\frac{1}{15}.\]
\[\frac{8}{30}-\frac{1}{15}=\frac{4}{15}-\frac{1}{15}=\frac{1}{5}.\]
Ответ: \(\frac{1}{5}\).