Ответ:
а) \(\frac{4}{7}\cdot\frac{7}{25}=\frac{4}{25}\).
б) \(\frac{2}{3}\cdot\frac{9}{8}=\frac{18}{24}=\frac{3}{4}\).
в) \(\frac{4}{11}\cdot\frac{11}{4}=1\).
г) \(\frac{21}{8}\cdot\frac{13}{14}=\frac{3\cdot13}{8\cdot2}=\frac{39}{16}\).
д) \(\frac{2}{11}\cdot\frac{3}{4}=\frac{3}{22}\).
е) \(\frac{10}{3}\cdot\frac{7}{100}=\frac{7}{30}\).
