3. \(4\frac{3}{10}-1\frac{7}{10}\)

\[4\frac{3}{10}-1\frac{7}{10}=3\frac{13}{10}-1\frac{7}{10}=2\frac{6}{10}=2\frac{3}{5}.\]

Ответ: \(2\frac{3}{5}\).