в) \(\frac{7}{10} - \frac{3}{5}\) е) \(\frac{7}{12} - \frac{7}{20}\) и) \(\frac{21}{22} - \frac{3}{55}\)

Решение:

в) \( \frac{7}{10} - \frac{3}{5} = \frac{7}{10} - \frac{6}{10} = \frac{1}{10} \)

е) \( \frac{7}{12} - \frac{7}{20} = \frac{35}{60} - \frac{21}{60} = \frac{14}{60} = \frac{7}{30} \)

и) \( \frac{21}{22} - \frac{3}{55} = \frac{105}{110} - \frac{6}{110} = \frac{99}{110} = \frac{9}{10} \)

Ответ: в) \(\frac{1}{10}\), е) \(\frac{7}{30}\), и) \(\frac{9}{10}\).