Решение:
- \( 1 \frac{2}{3} \% = \frac{5}{3} \% = \frac{5}{3} : 100 = \frac{5}{300} = \frac{1}{60} \).
- \( 2 \frac{3}{8} \% = \frac{19}{8} \% = \frac{19}{800} \).
- \( 20 \% = \frac{20}{100} = \frac{1}{5} \).
- \( 37 \frac{1}{2} \% = \frac{75}{2} \% = \frac{75}{200} = \frac{3}{8} \).
- \( 67 \frac{1}{2} \% = \frac{135}{2} \% = \frac{135}{200} = \frac{27}{40} \).
- \( 102 \frac{1}{3} \% = \frac{307}{3} \% = \frac{307}{300} \).
Ответ: \( \frac{1}{60} \); \( \frac{19}{800} \); \( \frac{1}{5} \); \( \frac{3}{8} \); \( \frac{27}{40} \); \( \frac{307}{300} \).