a) \(\frac{6}{12} = \frac{1}{2}\)
б) \(\frac{7}{14} = \frac{1}{2}\)
в) \(\frac{5}{25} = \frac{1}{5}\)
г) \(\frac{2}{18} = \frac{1}{9}\)
Ответ: a) \(\frac{1}{2}\); б) \(\frac{1}{2}\); в) \(\frac{1}{5}\); г) \(\frac{1}{9}\)