a) \(\frac{6}{11} \cdot \frac{5}{9} = \frac{6 \cdot 5}{11 \cdot 9} = \frac{2 \cdot 3 \cdot 5}{11 \cdot 3 \cdot 3} = \frac{2 \cdot 5}{11 \cdot 3} = \frac{10}{33}\)
б) \((\frac{2}{5})^3 = \frac{2}{5} \cdot \frac{2}{5} \cdot \frac{2}{5} = \frac{2 \cdot 2 \cdot 2}{5 \cdot 5 \cdot 5} = \frac{8}{125}\)
г) \(3 \cdot \frac{7}{13} = \frac{3 \cdot 7}{13} = \frac{21}{13}\)
\(\frac{21}{13} = 1 \frac{8}{13}\)
a) \(2 \frac{1}{3} \cdot \frac{12}{5} = \frac{2 \cdot 3 + 1}{3} \cdot \frac{12}{5} = \frac{7}{3} \cdot \frac{12}{5} = \frac{7 \cdot 12}{3 \cdot 5} = \frac{7 \cdot 3 \cdot 4}{3 \cdot 5} = \frac{7 \cdot 4}{5} = \frac{28}{5}\)
\(\frac{28}{5} = 5 \frac{3}{5}\)
б) \(1 \frac{4}{7} \cdot \frac{2}{22} = \frac{1 \cdot 7 + 4}{7} \cdot \frac{2}{22} = \frac{11}{7} \cdot \frac{2}{22} = \frac{11 \cdot 2}{7 \cdot 22} = \frac{11 \cdot 2}{7 \cdot 2 \cdot 11} = \frac{1}{7}\)
Ответ: a) \(\frac{10}{33}\), б) \(\frac{8}{125}\), г) \(1 \frac{8}{13}\); a) \(5 \frac{3}{5}\), б) \(\frac{1}{7}\)