Решение задач:
1. \( \frac{11}{4} - \frac{9}{32} = \frac{88}{32} - \frac{9}{32} = \frac{79}{32} \).
2. \( \frac{5}{21} \cdot \frac{10}{2} = \frac{50}{42} = \frac{25}{21} \).
3. \( 30.6 : 14 + 13.2 : 1.3 = 2.1857 + 10.1538 = 12.3395 \).
4. \( \frac{5}{16} = 0.3125 \).