433. Выполните действие: a) \frac{3}{4} \cdot \frac{5}{7}; г) \frac{2}{5} \cdot \frac{7}{11}; ж) \frac{2}{5} \cdot \frac{3}{2}; б) \frac{1}{8} \cdot \frac{3}{4}; д) \frac{1}{2} \cdot \frac{4}{9}; з) \frac{11}{15} \cdot \frac{3}{5}; в) \frac{4}{7} \cdot \frac{5}{6}; e) \frac{11}{12} \cdot \frac{8}{9}; и) \frac{15}{16} \cdot \frac{5}{9}; к) \frac{12}{25} \cdot \frac{9}{16}; л) \frac{14}{17} \cdot \frac{34}{63}; м) \frac{17}{26} \cdot \frac{13}{18}; н) (\frac{4}{5})^2; о) (\frac{2}{3})^3; п) (\frac{1}{7})^2.

а) \(\frac{3}{4} \cdot \frac{5}{7} = \frac{3 \cdot 5}{4 \cdot 7} = \frac{15}{28}\)

б) \(\frac{1}{8} \cdot \frac{3}{4} = \frac{1 \cdot 3}{8 \cdot 4} = \frac{3}{32}\)

в) \(\frac{4}{7} \cdot \frac{5}{6} = \frac{4 \cdot 5}{7 \cdot 6} = \frac{20}{42} = \frac{10}{21}\)

г) \(\frac{2}{5} \cdot \frac{7}{11} = \frac{2 \cdot 7}{5 \cdot 11} = \frac{14}{55}\)

д) \(\frac{1}{2} \cdot \frac{4}{9} = \frac{1 \cdot 4}{2 \cdot 9} = \frac{4}{18} = \frac{2}{9}\)

е) \(\frac{11}{12} \cdot \frac{8}{9} = \frac{11 \cdot 8}{12 \cdot 9} = \frac{88}{108} = \frac{22}{27}\)

ж) \(\frac{2}{5} \cdot \frac{3}{2} = \frac{2 \cdot 3}{5 \cdot 2} = \frac{6}{10} = \frac{3}{5}\)

з) \(\frac{11}{15} \cdot \frac{3}{5} = \frac{11 \cdot 3}{15 \cdot 5} = \frac{33}{75} = \frac{11}{25}\)

и) \(\frac{15}{16} \cdot \frac{5}{9} = \frac{15 \cdot 5}{16 \cdot 9} = \frac{75}{144} = \frac{25}{48}\)

к) \(\frac{12}{25} \cdot \frac{9}{16} = \frac{12 \cdot 9}{25 \cdot 16} = \frac{108}{400} = \frac{27}{100}\)

л) \(\frac{14}{17} \cdot \frac{34}{63} = \frac{14 \cdot 34}{17 \cdot 63} = \frac{476}{1071} = \frac{68}{153}\)

м) \(\frac{17}{26} \cdot \frac{13}{18} = \frac{17 \cdot 13}{26 \cdot 18} = \frac{221}{468}\)

н) \((\frac{4}{5})^2 = \frac{4}{5} \cdot \frac{4}{5} = \frac{16}{25}\)

о) \((\frac{2}{3})^3 = \frac{2}{3} \cdot \frac{2}{3} \cdot \frac{2}{3} = \frac{8}{27}\)

п) \((\frac{1}{7})^2 = \frac{1}{7} \cdot \frac{1}{7} = \frac{1}{49}\)