2. Вычислите: 1) \(4 \cdot \frac{5}{21}\); 2) \(24 \cdot \frac{7}{12}\); 3) \(\frac{16}{63} \cdot 9\); 4) \(36 \cdot \frac{13}{48}\);

1) \(4 \cdot \frac{5}{21} = \frac{4 \cdot 5}{21} = \frac{20}{21}\) 2) \(24 \cdot \frac{7}{12} = \frac{24 \cdot 7}{12} = \frac{2 \cdot 7}{1} = 14\) 3) \(\frac{16}{63} \cdot 9 = \frac{16 \cdot 9}{63} = \frac{16 \cdot 1}{7} = \frac{16}{7} = 2\frac{2}{7}\) 4) \(36 \cdot \frac{13}{48} = \frac{36 \cdot 13}{48} = \frac{3 \cdot 13}{4} = \frac{39}{4} = 9\frac{3}{4}\) Ответ: 1) \(\frac{20}{21}\); 2) 14; 3) \(2\frac{2}{7}\); 4) \(9\frac{3}{4}\)