a) \(\frac{6}{13} \cdot \frac{39}{2}\)
- \(\frac{6}{13} \cdot \frac{39}{2} = \frac{6 \cdot 39}{13 \cdot 2} = \frac{2 \cdot 3 \cdot 13 \cdot 3}{13 \cdot 2} = \frac{3 \cdot 3}{1} = 9\)
Ответ: 9
б) \(\frac{21}{11} : \frac{22}{3}\)
- \(\frac{21}{11} : \frac{22}{3} = \frac{21}{11} \cdot \frac{3}{22} = \frac{21 \cdot 3}{11 \cdot 22} = \frac{63}{242}\)
Ответ: \(\frac{63}{242}\)