\[\frac{5}{8}\ и\ \frac{3}{4}\]
\[\frac{3}{4} = \frac{3 \cdot 2}{4 \cdot 2} = \frac{6}{8};\]
\[\frac{5}{8}\ и\ \frac{6}{8}.\]
\[\frac{5}{8} < \frac{3}{4}.\]