a) $$4 \frac{5}{13} = \frac{4 \cdot 13 + 5}{13} = \frac{52 + 5}{13} = \frac{57}{13}$$
б) $$2 \frac{3}{25} = \frac{2 \cdot 25 + 3}{25} = \frac{50 + 3}{25} = \frac{53}{25}$$
в) $$5 \frac{1}{17} = \frac{5 \cdot 17 + 1}{17} = \frac{85 + 1}{17} = \frac{86}{17}$$
г) $$8 \frac{4}{125} = \frac{8 \cdot 125 + 4}{125} = \frac{1000 + 4}{125} = \frac{1004}{125}$$