д) \( \frac{5}{4} - \frac{3}{7} + \frac{5}{7} - \frac{1}{4} \)

\( \frac{5}{4} - \frac{1}{4} + \frac{5}{7} - \frac{3}{7} = \frac{4}{4} + \frac{2}{7} = 1 + \frac{2}{7} = \frac{9}{7} \)