8. Найдите разность: \(\frac{11}{12}-\frac{3}{14}\); \(\frac{5}{18}-\frac{1}{12}\); \(\frac{1}{4}-\frac{3}{17}\); \(\frac{5}{7}-\frac{1}{2}\); \(\frac{4}{5}-\frac{1}{6}\); \(\frac{2}{3}-\frac{5}{12}\).

1. \(\frac{11}{12}-\frac{3}{14}=\frac{77}{84}-\frac{18}{84}=\frac{59}{84}\).
2. \(\frac{5}{18}-\frac{1}{12}=\frac{10}{36}-\frac{3}{36}=\frac{7}{36}\).
3. \(\frac{1}{4}-\frac{3}{17}=\frac{17}{68}-\frac{12}{68}=\frac{5}{68}\).
4. \(\frac{5}{7}-\frac{1}{2}=\frac{10}{14}-\frac{7}{14}=\frac{3}{14}\).
5. \(\frac{4}{5}-\frac{1}{6}=\frac{24}{30}-\frac{5}{30}=\frac{19}{30}\).
6. \(\frac{2}{3}-\frac{5}{12}=\frac{8}{12}-\frac{5}{12}=\frac{1}{4}\).

Ответ: \(\frac{59}{84};\ \frac{7}{36};\ \frac{5}{68};\ \frac{3}{14};\ \frac{19}{30};\ \frac{1}{4}\).