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

• а) \(\frac{3}{14} + \frac{7}{14} = \frac{3+7}{14} = \frac{10}{14} = \frac{5}{7}\)
• 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) \(\frac{6}{21} + \frac{10}{21} - \frac{13}{21} = \frac{6+10-13}{21} = \frac{3}{21} = \frac{1}{7}\)
• е) \(\frac{35}{48} - \frac{20}{48} + \frac{1}{48} = \frac{35-20+1}{48} = \frac{16}{48} = \frac{1}{3}\)

Ответ: а) \(\frac{5}{7}\), б) 1, в) \(\frac{2}{7}\), г) \(\frac{1}{15}\), д) \(\frac{1}{7}\), е) \(\frac{1}{3}\)