a) \(\frac{15}{27} = \frac{5}{9}\)
б) \(\frac{14}{21} = \frac{2}{3}\)
в) \(\frac{30}{130} = \frac{3}{13}\)
г) \(\frac{15}{40} = \frac{3}{8}\)
Ответ: a) \(\frac{5}{9}\); б) \(\frac{2}{3}\); в) \(\frac{3}{13}\); г) \(\frac{3}{8}\)