а) \(\frac{6}{13} \cdot \frac{39}{2}\) = \(\frac{6 \cdot 39}{13 \cdot 2}\) = \(\frac{3 \cdot 3}{1 \cdot 1}\) = 9
Ответ: 9
б) \(\frac{21}{11} \cdot \frac{22}{3}\) = \(\frac{21 \cdot 22}{11 \cdot 3}\) = \(\frac{7 \cdot 2}{1 \cdot 1}\) = 14
Ответ: 14
в) (\(\frac{3}{10}\) + \(\frac{1}{2}\)) \(\cdot \frac{3}{2}\)
Ответ: \(1\frac{1}{5}\)