\[\boxed{\text{5.466.}}\]
\[\textbf{а)}\ 4 \cdot \frac{3}{5} = \frac{12}{5} = 2\frac{2}{5}\]
\[4 > 2\frac{2}{5}\]
\[\textbf{б)}\ \frac{2}{3} \cdot \frac{5}{8} = \frac{10}{24} = \frac{5}{12}\]
\[\frac{2}{3} = \frac{8}{12} > \frac{5}{12}\]
\[\textbf{в)}\ \frac{11}{4} \cdot \frac{4}{11} = 1\]
\[\frac{11}{4} = 2\frac{3}{4} > 1\]
\[\textbf{г)}\ \frac{21}{8} \cdot \frac{13}{14} = \frac{3 \cdot 13}{8 \cdot 2} = \frac{39}{16} = 2\frac{7}{16}\]
\[\frac{21}{8} = 2\frac{5}{8} = 2\frac{10}{16} > 2\frac{7}{16}\]
\[\textbf{д)}\ \frac{2}{11} \cdot \frac{3}{4} = \frac{3}{22}\]
\[\frac{2}{11} = \frac{4}{22} > \frac{3}{22}\]
\[\textbf{е)}\ \frac{10}{3} \cdot \frac{7}{100} = \frac{7}{30}\ \]
\[\frac{10}{3} = 3\frac{1}{3} > \frac{7}{30}\]
\[Число\ при\ умножении\ на\ \]
\[правильную\ дробь\ \]
\[уменьшается.\]