3. Вычислите: 1) 1 7/18 − 4/15; 2) 4 4/5 · 4 1/6; 3) 3 1/9 : 4 2/3; 4) (30 : 27 − 1/3) · 2 1/7 + 2/5.

1. \(1\dfrac{7}{18}-\dfrac{4}{15}=1+\dfrac{35}{90}-\dfrac{24}{90}=1\dfrac{11}{90}\).
2. \(4\dfrac{4}{5}\cdot4\dfrac{1}{6}=\dfrac{24}{5}\cdot\dfrac{25}{6}=20\).
3. \(3\dfrac{1}{9}:4\dfrac{2}{3}=\dfrac{28}{9}:\dfrac{14}{3}=\dfrac{28}{9}\cdot\dfrac{3}{14}=\dfrac{2}{3}\).
4. \((30:27-\dfrac{1}{3})\cdot2\dfrac{1}{7}+\dfrac{2}{5}=\left(\dfrac{10}{9}-\dfrac{1}{3}\right)\cdot\dfrac{15}{7}+\dfrac{2}{5}=\dfrac{7}{9}\cdot\dfrac{15}{7}+\dfrac{2}{5}=\dfrac{5}{3}+\dfrac{2}{5}=\dfrac{31}{15}=2\dfrac{1}{15}\).

Ответ: 1) \(1\dfrac{11}{90}\); 2) \(20\); 3) \(\dfrac{2}{3}\); 4) \(2\dfrac{1}{15}\).