a) $$ 8 \frac{1}{2} = \frac{8 \cdot 2 + 1}{2} = \frac{16 + 1}{2} = \frac{17}{2} $$
б) $$ 3 \frac{3}{4} = \frac{3 \cdot 4 + 3}{4} = \frac{12 + 3}{4} = \frac{15}{4} $$
в) $$ 5 \frac{1}{3} = \frac{5 \cdot 3 + 1}{3} = \frac{15 + 1}{3} = \frac{16}{3} $$
Ответ: a) $$\frac{17}{2}$$, б) $$\frac{15}{4}$$, в) $$\frac{16}{3}$$