2. Вычислите: a) \(\frac{4}{7} - \frac{1}{3}\) в) \(\frac{4}{7} - \frac{3}{14}\)

Решение:

a) \(\frac{4}{7} - \frac{1}{3} = \frac{4 \cdot 3}{7 \cdot 3} - \frac{1 \cdot 7}{3 \cdot 7} = \frac{12}{21} - \frac{7}{21} = \frac{12 - 7}{21} = \frac{5}{21}\)

в) \(\frac{4}{7} - \frac{3}{14} = \frac{4 \cdot 2}{7 \cdot 2} - \frac{3}{14} = \frac{8}{14} - \frac{3}{14} = \frac{8 - 3}{14} = \frac{5}{14}\)

Ответ: a) \(\frac{5}{21}\); в) \(\frac{5}{14}\)