Ответ:
- \(1\frac{7}{15}-\frac{4}{25}=1+\frac{35}{75}-\frac{12}{75}=1\frac{23}{75}\).
- \(6\frac{3}{4}\cdot1\frac{7}{9}=\frac{27}{4}\cdot\frac{16}{9}=12\).
- \(3\frac{1}{5}:2\frac{2}{5}=\frac{16}{5}:\frac{12}{5}=\frac{16}{5}\cdot\frac{5}{12}=\frac{4}{3}=1\frac{1}{3}\).
Ответ: 1) \(1\frac{23}{75}\); 2) \(12\); 3) \(1\frac{1}{3}\).
