Проверочная работа № 2 1 Вычислите: a) \(\frac{3}{14} + \frac{7}{14}\); б) \(\frac{8}{15} + \frac{7}{15}\); в) \(\frac{7}{14} - \frac{3}{14}\); г) \(\frac{8}{15} - \frac{7}{15}\); д) \(\frac{6}{21} + \frac{10}{21} - \frac{13}{21}\); e) \(\frac{35}{48} - \frac{20}{48} + \frac{1}{48}\).

a) \(\frac{3}{14} + \frac{7}{14} = \frac{3+7}{14} = \frac{10}{14} = \frac{5}{7}\)

б) \(\frac{8}{15} + \frac{7}{15} = \frac{8+7}{15} = \frac{15}{15} = 1\)

в) \(\frac{7}{14} - \frac{3}{14} = \frac{7-3}{14} = \frac{4}{14} = \frac{2}{7}\)

г) \(\frac{8}{15} - \frac{7}{15} = \frac{8-7}{15} = \frac{1}{15}\)

д) \(\frac{6}{21} + \frac{10}{21} - \frac{13}{21} = \frac{6+10-13}{21} = \frac{3}{21} = \frac{1}{7}\)

e) \(\frac{35}{48} - \frac{20}{48} + \frac{1}{48} = \frac{35-20+1}{48} = \frac{16}{48} = \frac{1}{3}\)

Ответ: а) \(\frac{5}{7}\); б) 1; в) \(\frac{2}{7}\); г) \(\frac{1}{15}\); д) \(\frac{1}{7}\); e) \(\frac{1}{3}\).