\[5\frac{1}{5} - 3\frac{1}{5^4} = \frac{26}{5} - \frac{3\cdot 5^4 + 1}{5^4} = \frac{26}{5} - \frac{3\cdot 625 + 1}{625} = \frac{26}{5} - \frac{1876}{625} = \frac{26 \cdot 125}{5 \cdot 125} - \frac{1876}{625} = \frac{3250 - 1876}{625} = \frac{1374}{625} = 2\frac{124}{625}\]
Ответ: \(2\frac{124}{625}\)