6) 2 - 0,75 : 5/4 + (3,25 - 4/3) * 2 - (5,5 - 3)/4 * 17

Решение:

1. \( 0,75 : \frac{5}{4} = \frac{3}{4} \cdot \frac{4}{5} = \frac{3}{5} = 0,6 \)
2. \( 3,25 - \frac{4}{3} = \frac{325}{100} - \frac{4}{3} = \frac{13}{4} - \frac{4}{3} = \frac{13 \cdot 3 - 4 \cdot 4}{12} = \frac{39 - 16}{12} = \frac{23}{12} \)
3. \( \frac{23}{12} \cdot 2 = \frac{23}{6} \)
4. \( 5,5 - 3 = 2,5 \)
5. \( \frac{2,5}{4} = \frac{25}{40} = \frac{5}{8} \)
6. \( \frac{5}{8} \cdot 17 = \frac{85}{8} \)
7. \( 2 - 0,6 + \frac{23}{6} - \frac{85}{8} = 1,4 + \frac{23}{6} - \frac{85}{8} \)
8. \( 1,4 + \frac{23 \cdot 4 - 85 \cdot 3}{24} = 1,4 + \frac{92 - 255}{24} = 1,4 + \frac{-163}{24} \)
9. \( \frac{14}{10} - \frac{163}{24} = \frac{7}{5} - \frac{163}{24} = \frac{7 \cdot 24 - 163 \cdot 5}{120} = \frac{168 - 815}{120} = \frac{-647}{120} \)
10. \( \frac{-647}{120} \approx -5,39167 \)

Ответ: -647/120