1. Вычислите: a) \( \frac{4}{33} \cdot \frac{11}{19} \) b) \( 2 \frac{4}{9} \cdot 2 \frac{1}{4} \) в) \( \frac{3}{22} \cdot \frac{22}{3} \) г) \( 1 \frac{1}{5} : 2 \frac{5}{6} \)

a) \( \frac{4}{33} \cdot \frac{11}{19} = \frac{4 \cdot 11}{33 \cdot 19} = \frac{4 \cdot 1}{3 \cdot 19} = \frac{4}{57} \) б) \( 2 \frac{4}{9} \cdot 2 \frac{1}{4} = \frac{22}{9} \cdot \frac{9}{4} = \frac{22 \cdot 9}{9 \cdot 4} = \frac{22}{4} = \frac{11}{2} = 5 \frac{1}{2} \) в) \( \frac{3}{22} \cdot \frac{22}{3} = \frac{3 \cdot 22}{22 \cdot 3} = 1 \) г) \( 1 \frac{1}{5} : 2 \frac{5}{6} = \frac{6}{5} : \frac{17}{6} = \frac{6}{5} \cdot \frac{6}{17} = \frac{6 \cdot 6}{5 \cdot 17} = \frac{36}{85} \) Ответ: a) \( \frac{4}{57} \) б) \( 5 \frac{1}{2} \) в) 1 г) \( \frac{36}{85} \)