a) \(\frac{45}{100} = \frac{5 \cdot 9}{5 \cdot 20} = \frac{9}{20}\)
б) \(\frac{75}{1000} = \frac{25 \cdot 3}{25 \cdot 40} = \frac{3}{40}\)
в) \(\frac{1125}{1500} = \frac{225 \cdot 5}{225 \cdot 6} = \frac{5}{6}\)
Ответ: а) \(\frac{9}{20}\); б) \(\frac{3}{40}\); в) \(\frac{5}{6}\)