Выполни умножение: 1) 1 1/2 · 1 1/5 = ...; 2) 2 1/5 · 3 1/11 = ...; 3) 3 5/9 · 4 1/8 = ...; 4) 18 · 3 2/9 = ....

1. \(1\frac{1}{2}\cdot1\frac{1}{5}=\frac{3}{2}\cdot\frac{6}{5}=\frac{18}{10}=\frac{9}{5}=1\frac{4}{5}\).
2. \(2\frac{1}{5}\cdot3\frac{1}{11}=\frac{11}{5}\cdot\frac{34}{11}=\frac{34}{5}=6\frac{4}{5}\).
3. \(3\frac{5}{9}\cdot4\frac{1}{8}=\frac{32}{9}\cdot\frac{33}{8}=\frac{44}{3}=14\frac{2}{3}\).
4. \(18\cdot3\frac{2}{9}=18\cdot\frac{29}{9}=58\).

Ответ: 1) 1 4/5; 2) 6 4/5; 3) 14 2/3; 4) 58.