Решим пример по действиям:
- $$\frac{1}{2} + \frac{5}{14} = \frac{1 \cdot 7}{2 \cdot 7} + \frac{5}{14} = \frac{7}{14} + \frac{5}{14} = \frac{7+5}{14} = \frac{12}{14} = \frac{6}{7}$$.
- $$\frac{5}{6} : \frac{10}{27} = \frac{5}{6} \cdot \frac{27}{10} = \frac{5 \cdot 27}{6 \cdot 10} = \frac{1 \cdot 9}{2 \cdot 2} = \frac{9}{4}$$.
- $$ \frac{35}{36} \cdot \frac{6}{7} = \frac{35 \cdot 6}{36 \cdot 7} = \frac{5 \cdot 1}{6 \cdot 1} = \frac{5}{6}$$.
- $$\frac{5}{6} - \frac{9}{4} = \frac{5 \cdot 2}{6 \cdot 2} - \frac{9 \cdot 3}{4 \cdot 3} = \frac{10}{12} - \frac{27}{12} = \frac{10-27}{12} = -\frac{17}{12}$$.
Ответ: $$\frac{-17}{12}$$