3. Вычислите: 1) 1 7/15 − 4/25; 2) 6 3/4 · 1 7/9; 3) 3 1/5 : 2 2/5; 4) (48 : 45 − 1/3) · 2 3/11 + 3/5.
- \(1\frac{7}{15}-\frac{4}{25}=1+\frac{35}{75}-\frac{12}{75}=1\frac{23}{75}\).
- \(6\frac{3}{4}\cdot1\frac{7}{9}=\frac{27}{4}\cdot\frac{16}{9}=12\).
- \(3\frac{1}{5}:2\frac{2}{5}=\frac{16}{5}:\frac{12}{5}=\frac{16}{5}\cdot\frac{5}{12}=\frac{4}{3}=1\frac{1}{3}\).
- \(\left(48:45-\frac13\right)\cdot2\frac{3}{11}+\frac35=\left(\frac{16}{15}-\frac{5}{15}\right)\cdot\frac{25}{11}+\frac35=\frac{11}{15}\cdot\frac{25}{11}+\frac35=\frac53+\frac35=\frac{34}{15}=2\frac{4}{15}\).