Ответ:

  1. \(\frac{45}{630}=\frac{45:45}{630:45}=\frac{1}{14}\).
  2. \(\frac{30}{64}=\frac{30:2}{64:2}=\frac{15}{32}\).
  3. \(\frac{125}{500}=\frac{125:125}{500:125}=\frac{1}{4}\).