\[\frac{4}{7} : \frac{16}{21} = \frac{4}{7} \cdot \frac{21}{16} = \frac{4 \cdot 21}{7 \cdot 16} = \frac{84}{112}\]
\[\frac{84}{112} = \frac{21}{28} = \frac{3}{4}\]
\[1 - \frac{3}{4} = \frac{4}{4} - \frac{3}{4} = \frac{1}{4}\]
Ответ: 1/4
\[\frac{7}{39} \cdot (\frac{11}{14} - \frac{1}{6})\]
\[\frac{11}{14} - \frac{1}{6} = \frac{11 \cdot 3}{14 \cdot 3} - \frac{1 \cdot 7}{6 \cdot 7} = \frac{33}{42} - \frac{7}{42} = \frac{26}{42}\]
\[\frac{26}{42} = \frac{13}{21}\]
\[\frac{7}{39} \cdot \frac{13}{21} = \frac{7 \cdot 13}{39 \cdot 21} = \frac{91}{819}\]
\[\frac{91}{819} = \frac{1}{9}\]
Ответ: 1/9
\[\frac{24}{49} : \frac{6}{7} + \frac{1}{14}\]
\[\frac{24}{49} : \frac{6}{7} = \frac{24}{49} \cdot \frac{7}{6} = \frac{24 \cdot 7}{49 \cdot 6} = \frac{168}{294}\]
\[\frac{168}{294} = \frac{4}{7}\]
\[\frac{4}{7} + \frac{1}{14} = \frac{4 \cdot 2}{7 \cdot 2} + \frac{1}{14} = \frac{8}{14} + \frac{1}{14} = \frac{9}{14}\]
Ответ: 9/14
\[\frac{5}{6} - \frac{4}{9} : \frac{16}{21}\]