\( \frac{6}{5} : \frac{4}{5} = \frac{6}{5} \cdot \frac{5}{4} = \frac{6}{4} = \frac{3}{2} \)
\( -\frac{8}{5} + \frac{3}{2} = \frac{-16 + 15}{10} = -\frac{1}{10} \)
\( -\frac{1}{10} \cdot \frac{8}{25} = -\frac{8}{250} = -\frac{4}{125} \)
\( \frac{3}{4} + (-\frac{4}{125}) = \frac{3}{4} - \frac{4}{125} = \frac{3 \cdot 125 - 4 \cdot 4}{500} = \frac{375 - 16}{500} = \frac{359}{500} \)
Ответ: 359/500