№1 Сократите дробь 6/40, 32/72, 16/72, 63/91.

1. \( \frac{6}{40} = \frac{3}{20} \), 2. \( \frac{32}{72} = \frac{4}{9} \), 3. \( \frac{16}{72} = \frac{2}{9} \), 4. \( \frac{63}{91} = \frac{7}{13} \).