3. Найдите значение выражения: 1) $$2\frac{5}{14} \cdot 2\frac{6}{11} - \frac{9}{25} \cdot 1\frac{2}{3}$$; 2) $$(15\frac{5}{6} - 9\frac{25}{27}) - 2\frac{17}{18}$$

1) $$2\frac{5}{14} \cdot 2\frac{6}{11} - \frac{9}{25} \cdot 1\frac{2}{3} = \frac{33}{14} \cdot \frac{28}{11} - \frac{9}{25} \cdot \frac{5}{3} = \frac{3 \cdot 2}{1 \cdot 1} - \frac{3}{5} \cdot \frac{1}{1} = 6 - \frac{3}{5} = \frac{30}{5} - \frac{3}{5} = \frac{27}{5} = 5\frac{2}{5}$$ 2) $$(15\frac{5}{6} - 9\frac{25}{27}) - 2\frac{17}{18} = (15\frac{45}{54} - 9\frac{50}{54}) - 2\frac{17}{18} = (14\frac{99}{54} - 9\frac{50}{54}) - 2\frac{17}{18} = 5\frac{49}{54} - 2\frac{17}{18} = 5\frac{49}{54} - 2\frac{51}{54} = 4\frac{103}{54} - 2\frac{51}{54} = 2\frac{52}{54} = 2\frac{26}{27}$$ Ответ: 1) $$5\frac{2}{5}$$ 2) $$2\frac{26}{27}$$