a) \(\frac{5}{7} \cdot \frac{5}{9} = \frac{5 \cdot 5}{7 \cdot 9} = \frac{25}{63}\)
б) \(\frac{6}{25} \cdot \frac{5}{12} = \frac{6 \cdot 5}{25 \cdot 12} = \frac{30}{300} = \frac{1}{10}\)
в) \(14 \cdot \frac{5}{7} = \frac{14 \cdot 5}{7} = \frac{70}{7} = 10\)