л) \(\frac{7}{450} + \frac{8}{180}\)
- \(\frac{7}{450} + \frac{8}{180} = \frac{7 \cdot 2}{450 \cdot 2} + \frac{8 \cdot 5}{180 \cdot 5} = \frac{14}{900} + \frac{40}{900} = \frac{14 + 40}{900} = \frac{54}{900} = \frac{18 \cdot 3}{18 \cdot 50} = \frac{3}{50}\)
Ответ: \(\frac{3}{50}\)