Решим примеры по действиям.
- $$ \frac{8}{30} - \frac{2}{50} + \frac{3}{60} = \frac{8 \cdot 10}{30 \cdot 10} - \frac{2 \cdot 6}{50 \cdot 6} + \frac{3 \cdot 5}{60 \cdot 5} = \frac{80}{300} - \frac{12}{300} + \frac{15}{300} = \frac{80 - 12 + 15}{300} = \frac{83}{300}$$
- $$1 \frac{1}{3} - \frac{1}{4} = \frac{4}{3} - \frac{1}{4} = \frac{4 \cdot 4}{3 \cdot 4} - \frac{1 \cdot 3}{4 \cdot 3} = \frac{16}{12} - \frac{3}{12} = \frac{16 - 3}{12} = \frac{13}{12} = 1 \frac{1}{12}$$
- $$4 \frac{5}{17} + \frac{1}{34} - \frac{1}{6} = \frac{4 \cdot 17 + 5}{17} + \frac{1}{34} - \frac{1}{6} = \frac{68 + 5}{17} + \frac{1}{34} - \frac{1}{6} = \frac{73}{17} + \frac{1}{34} - \frac{1}{6} = \frac{73 \cdot 2}{17 \cdot 2} + \frac{1}{34} - \frac{1}{6} = \frac{146}{34} + \frac{1}{34} - \frac{1}{6} = \frac{146 + 1}{34} - \frac{1}{6} = \frac{147}{34} - \frac{1}{6} = \frac{147 \cdot 3}{34 \cdot 3} - \frac{1 \cdot 17}{6 \cdot 17} = \frac{441}{102} - \frac{17}{102} = \frac{441 - 17}{102} = \frac{424}{102} = \frac{212}{51} = 4 \frac{8}{51}$$
Ответ: $$ \frac{83}{300}; 1 \frac{1}{12}; 4 \frac{8}{51} $$