Ответ:

Вычитаем вторую дробь из первой.

  1. а) \(\frac{5}{6}-\frac{2}{3}=\frac{5}{6}-\frac{4}{6}=\frac{1}{6}\).
  2. б) \(\frac{5}{6}-\frac{7}{12}=\frac{10}{12}-\frac{7}{12}=\frac{1}{4}\).
  3. в) \(\frac{11}{15}-\frac{2}{3}=\frac{11}{15}-\frac{10}{15}=\frac{1}{15}\).
  4. г) \(\frac{40}{60}-\frac{9}{15}=\frac{40}{60}-\frac{36}{60}=\frac{1}{15}\).
  5. д) \(\frac{2}{3}-\frac{1}{8}=\frac{16}{24}-\frac{3}{24}=\frac{13}{24}\).
  6. е) \(\frac{17}{42}-\frac{6}{21}=\frac{17}{42}-\frac{12}{42}=\frac{5}{42}\).
  7. ж) \(\frac{2}{8}-\frac{4}{24}=\frac{6}{24}-\frac{4}{24}=\frac{1}{12}\).
  8. з) \(\frac{23}{45}-\frac{4}{15}=\frac{23}{45}-\frac{12}{45}=\frac{11}{45}\).