Ответ:

а) \(\frac{3}{7}\cdot\frac{2}{3}=\frac{2}{7}\)

б) \(\frac{7}{10}\cdot\frac{4}{15}=\frac{28}{150}=\frac{14}{75}\)

в) \(\frac{15}{16}\cdot\frac{10}{11}=\frac{150}{176}=\frac{75}{88}\)

г) \(\frac{38}{45}\cdot\frac{18}{19}=\frac{2}{5}\cdot\frac{2}{1}=\frac{4}{5}\)

д) \(\frac{12}{25}\cdot\frac{5}{16}=\frac{3}{5}\cdot\frac{1}{4}=\frac{3}{20}\)

е) \(\frac{9}{26}\cdot\frac{13}{18}=\frac{1}{2}\cdot\frac{1}{2}=\frac{1}{4}\)

Ответ: а) \(\frac{2}{7}\); б) \(\frac{14}{75}\); в) \(\frac{75}{88}\); г) \(\frac{4}{5}\); д) \(\frac{3}{20}\); е) \(\frac{1}{4}\).