Ответ:
\(\frac{5}{18}-\frac{7}{24}=\frac{20-21}{72}=-\frac{1}{72}\).
\(3\frac{3}{5}\cdot\left(-\frac{1}{72}\right)=\frac{18}{5}\cdot\left(-\frac{1}{72}\right)=-\frac{1}{20}\).
\(\frac{3}{4}-\frac{1}{20}-\frac{1}{5}=\frac{15-1-4}{20}=\frac{10}{20}=\frac{1}{2}\).
Ответ: \(\frac{1}{2}\).
