Выполни умножение в задании 477

477. а) $\frac{9}{10} \cdot \frac{5}{6} = \frac{9 \cdot 5}{10 \cdot 6} = \frac{45}{60} = \frac{3}{4}$ б) $\frac{6}{25} \cdot \frac{20}{21} = \frac{6 \cdot 20}{25 \cdot 21} = \frac{120}{525} = \frac{8}{35}$ в) $\frac{17}{30} \cdot \frac{26}{51} = \frac{17 \cdot 26}{30 \cdot 51} = \frac{442}{1530} = \frac{13}{45}$ г) $\frac{40}{7} \cdot \frac{14}{5} = \frac{40 \cdot 14}{7 \cdot 5} = \frac{560}{35} = 16$ д) $\frac{57}{37} \cdot \frac{74}{76} = \frac{57 \cdot 74}{37 \cdot 76} = \frac{4218}{2812} = \frac{114}{76} = \frac{57}{38} = 1 \frac{19}{38} = 1 \frac{1}{2}$ е) $\frac{81}{115} \cdot \frac{46}{81} = \frac{81 \cdot 46}{115 \cdot 81} = \frac{46}{115} = \frac{2}{5}$ ж) $\frac{3}{16} \cdot 4 = \frac{3 \cdot 4}{16} = \frac{12}{16} = \frac{3}{4}$ з) $23 \cdot \frac{5}{46} = \frac{23 \cdot 5}{46} = \frac{115}{46} = 2 \frac{23}{46} = 2 \frac{1}{2}$ и) $13 \cdot \frac{5}{39} = \frac{13 \cdot 5}{39} = \frac{65}{39} = 1 \frac{26}{39} = 1 \frac{2}{3}$ к) $5 \cdot 2 \frac{1}{5} = 5 \cdot \frac{11}{5} = \frac{5 \cdot 11}{5} = 11$ л) $3 \frac{3}{5} \cdot 1 \frac{1}{9} = \frac{18}{5} \cdot \frac{10}{9} = \frac{18 \cdot 10}{5 \cdot 9} = \frac{180}{45} = 4$ м) $4 \frac{2}{7} \cdot 2 = \frac{30}{7} \cdot 2 = \frac{30 \cdot 2}{7} = \frac{60}{7} = 8 \frac{4}{7}$ н) $2 \frac{14}{15} \cdot 6 \frac{6}{11} = \frac{44}{15} \cdot \frac{72}{11} = \frac{44 \cdot 72}{15 \cdot 11} = \frac{3168}{165} = 19 \frac{33}{165} = 19 \frac{1}{5}$ о) $2 \frac{2}{25} \cdot 1 \frac{9}{16} = \frac{52}{25} \cdot \frac{25}{16} = \frac{52 \cdot 25}{25 \cdot 16} = \frac{52}{16} = \frac{13}{4} = 3 \frac{1}{4}$ п) $\frac{13}{43} \cdot \frac{7}{8} \frac{7}{26} = \frac{13}{43} \cdot \frac{215}{26} = \frac{13 \cdot 215}{43 \cdot 26} = \frac{2795}{1118} = 2 \frac{559}{1118} = 2 \frac{1}{2}