1. Вычислите: a) 1$$\frac{1}{2}\cdot1\frac{1}{3}$$; 6) 1$$\frac{1}{9}\cdot1,3$$; 日) 1$$\frac{1}{9}\cdot2\frac{2}{5}$$

a) $$1\frac{1}{2}\cdot1\frac{1}{3} = \frac{3}{2}\cdot\frac{4}{3} = \frac{3\cdot4}{2\cdot3} = \frac{12}{6} = 2$$

б) $$1\frac{1}{9}\cdot1,3 = \frac{10}{9}\cdot1,3 = \frac{10}{9}\cdot\frac{13}{10} = \frac{10\cdot13}{9\cdot10} = \frac{130}{90} = \frac{13}{9} = 1\frac{4}{9}$$

в) $$1\frac{1}{9}\cdot2\frac{2}{5} = \frac{10}{9}\cdot\frac{12}{5} = \frac{10\cdot12}{9\cdot5} = \frac{120}{45} = \frac{8}{3} = 2\frac{2}{3}$$

Ответ: а) 2; б) $$1\frac{4}{9}$$; в) $$2\frac{2}{3}$$