\[0,7 = \frac{7}{10} = \frac{14}{20};\ \ 0,8 = \frac{8}{10} = \frac{16}{20};\ \]
\[\frac{3}{4} = \frac{15}{20};\ \ \frac{8}{7} > 1.\]
\[Наименьшее\ число:0,7.\]