С) -\(\frac{26}{69}\):(-\(\frac{52}{57}\))

Решение:

\( -\frac{26}{69} : (-\frac{52}{57}) = \frac{26}{69} \cdot \frac{57}{52} = \frac{1}{69} \cdot \frac{57}{2} = \frac{57}{138} = \frac{19}{46} \)

Ответ: \(\frac{19}{46}\)