\[\ \boxed{\text{5.369.}}\]
\[\textbf{а)}\ \frac{3}{4}\ и\ \frac{2}{3}\ \]
\[\frac{3}{4} = \frac{9}{12};\ \ \ \ \ \ \ \frac{2}{3} = \frac{8}{12}\text{.\ }\]
\[\textbf{б)}\ \frac{4}{5}\ и\ \frac{3}{7}\]
\[\frac{4}{5} = \frac{28}{35};\ \ \ \ \ \ \ \frac{3}{7} = \frac{15}{35}\text{.\ }\]
\[\textbf{в)}\ \frac{3}{10}\ и\ \frac{7}{9}\]
\[\frac{3}{10} = \frac{27}{90};\ \ \ \ \ \ \frac{7}{9} = \frac{70}{90}\text{.\ }\]
\[\textbf{г)}\ \frac{5}{3}\ и\ \frac{4}{9}\ \]
\[\frac{5}{9} = \frac{15}{9};\ \ \ \ \ \ \ \frac{4}{9}\text{.\ \ }\]