Ответ:

\(1\frac{5}{6}=\frac{11}{6}\), а \(1\frac{29}{36}=\frac{65}{36}\).

\(\left(\frac{11}{6}-\frac{3}{4}\right)^2:\frac{65}{36}=\left(\frac{22}{12}-\frac{9}{12}\right)^2:\frac{65}{36}=\left(\frac{13}{12}\right)^2\cdot\frac{36}{65}\).

\(\frac{169}{144}\cdot\frac{36}{65}=\frac{169}{260}=\frac{13}{20}\).

Ответ: \(\frac{13}{20}\).