3 Выполни действия: a) \frac{5}{7} - \frac{2}{7} + \frac{6}{7} = б) \frac{3}{4} + \frac{1}{4} + \frac{2}{4} = B) \frac{14}{10} - \frac{5}{10} - \frac{8}{10} = г) \frac{19}{21} + \frac{7}{21} - \frac{5}{21} =

Выполним действия с дробями:

1. \(\frac{5}{7} - \frac{2}{7} + \frac{6}{7} = \frac{5-2+6}{7} = \frac{9}{7}\)
2. \(\frac{3}{4} + \frac{1}{4} + \frac{2}{4} = \frac{3+1+2}{4} = \frac{6}{4} = \frac{3}{2}\)
3. \(\frac{14}{10} - \frac{5}{10} - \frac{8}{10} = \frac{14-5-8}{10} = \frac{1}{10}\)
4. \(\frac{19}{21} + \frac{7}{21} - \frac{5}{21} = \frac{19+7-5}{21} = \frac{21}{21} = 1\)

Ответ:

• $$\frac{9}{7}$$
• $$\frac{3}{2}$$
• $$\frac{1}{10}$$
• $$1$$