Вопрос:

1) \((3\frac{5}{6}-2\frac{3}{4}):\frac{7}{12}\)

Ответ:

\(3\frac{5}{6}=\frac{23}{6}\), \(2\frac{3}{4}=\frac{11}{4}\).

\(\left(\frac{23}{6}-\frac{11}{4}\right):\frac{7}{12}=\left(\frac{46}{12}-\frac{33}{12}\right)\cdot\frac{12}{7}=\frac{13}{12}\cdot\frac{12}{7}=\frac{13}{7}\).

Ответ: \(\frac{13}{7}\).