Ответ:
- \(2\frac{3}{5}\cdot1\frac{9}{26}=\frac{13}{5}\cdot\frac{35}{26}=\frac{7}{2}=3\frac{1}{2}\).
- \(\frac{7}{19}\cdot57=\frac{7}{19}\cdot19\cdot3=21\).
- \(2\frac{2}{5}:1\frac{1}{15}=\frac{12}{5}:\frac{16}{15}=\frac{12}{5}\cdot\frac{15}{16}=\frac{9}{4}=2\frac{1}{4}\).
- \(6:\frac{12}{13}=6\cdot\frac{13}{12}=\frac{13}{2}=6\frac{1}{2}\).
- \(\frac{6}{19}:2=\frac{6}{19}\cdot\frac{1}{2}=\frac{3}{19}\).
Ответ: 1) \(3\frac{1}{2}\); 2) \(21\); 3) \(2\frac{1}{4}\); 4) \(6\frac{1}{2}\); 5) \(\frac{3}{19}\).
