Ответ:

\(1\frac{3}{4}=\frac{7}{4}\).

\(\left(\frac{7}{4}+\frac{2}{3}\right)\div\frac{1}{2}-\frac{1}{5}=\frac{29}{12}\cdot2-\frac{1}{5}=\frac{29}{6}-\frac{1}{5}\).

\(\frac{29}{6}-\frac{1}{5}=\frac{145-6}{30}=\frac{139}{30}=4\frac{19}{30}\).

Ответ: \(4\frac{19}{30}\).