Ответ:
\[\frac{8}{25}-\frac{13}{38}=\frac{8\cdot38-13\cdot25}{25\cdot38}=\frac{304-325}{950}=-\frac{21}{950}.\]
\[ -\frac{21}{950}:\frac{6}{19}=-\frac{21}{950}\cdot\frac{19}{6}=-\frac{399}{5700}=-\frac{7}{100}.\]
Ответ: \(-\frac{7}{100}\).
\[\frac{8}{25}-\frac{13}{38}=\frac{8\cdot38-13\cdot25}{25\cdot38}=\frac{304-325}{950}=-\frac{21}{950}.\]
\[ -\frac{21}{950}:\frac{6}{19}=-\frac{21}{950}\cdot\frac{19}{6}=-\frac{399}{5700}=-\frac{7}{100}.\]
Ответ: \(-\frac{7}{100}\).