491. 1) \frac{12 \frac{4}{5} \cdot 3 \frac{3}{4} - 4 \frac{4}{11} \cdot 4 \frac{1}{8}}{11 \frac{2}{3} : 2 \frac{4}{7}} 2) \frac{28 \frac{4}{5} : 13 \frac{5}{7} + 6 \frac{3}{5} : 2 \frac{2}{3}}{1 \frac{11}{16} : 2 \frac{1}{4}} 3) \frac{2 \frac{3}{8} : \frac{3}{4} + 24 \frac{7}{9}}{7 \frac{1}{8} - 157 \frac{4}{5} : 24} 4) \frac{(1 \frac{1}{2} + 2 \frac{2}{3} + 3 \frac{3}{4}) \cdot 3 \frac{3}{5}}{14 - 15 \frac{1}{8} : 2 \frac{1}{5}}

1)

\begin{aligned} &\frac{12 \frac{4}{5} \cdot 3 \frac{3}{4} - 4 \frac{4}{11} \cdot 4 \frac{1}{8}}{11 \frac{2}{3} : 2 \frac{4}{7}} = \frac{\frac{64}{5} \cdot \frac{15}{4} - \frac{48}{11} \cdot \frac{33}{8}}{\frac{35}{3} : \frac{18}{7}} = \frac{\frac{16 \cdot 15}{1 \cdot 4} - \frac{6 \cdot 3}{1 \cdot 1}}{\frac{35}{3} \cdot \frac{7}{18}} = \frac{16 \cdot \frac{15}{5} - 18}{\frac{35 \cdot 7}{3 \cdot 18}} = \frac{12 \cdot 3 - 18}{\frac{245}{54}} = \frac{48 - 18}{\frac{245}{54}} = \frac{30}{\frac{245}{54}} = 30 \cdot \frac{54}{245} = \frac{30 \cdot 54}{245} = \frac{6 \cdot 54}{49} = \frac{324}{49} = 6 \frac{30}{49} \end{aligned}

Ответ: 6 \frac{30}{49}

2)

\begin{aligned} &\frac{28 \frac{4}{5} : 13 \frac{5}{7} + 6 \frac{3}{5} : 2 \frac{2}{3}}{1 \frac{11}{16} : 2 \frac{1}{4}} = \frac{\frac{144}{5} : \frac{96}{7} + \frac{33}{5} : \frac{8}{3}}{\frac{27}{16} : \frac{9}{4}} = \frac{\frac{144}{5} \cdot \frac{7}{96} + \frac{33}{5} \cdot \frac{3}{8}}{\frac{27}{16} \cdot \frac{4}{9}} = \frac{\frac{3 \cdot 7}{5 \cdot 2} + \frac{33 \cdot 3}{5 \cdot 8}}{\frac{3}{4} \cdot 1} = \frac{\frac{21}{10} + \frac{99}{40}}{\frac{3}{4}} = \frac{\frac{84 + 99}{40}}{\frac{3}{4}} = \frac{\frac{183}{40}}{\frac{3}{4}} = \frac{183}{40} \cdot \frac{4}{3} = \frac{61}{10} \cdot \frac{1}{1} = \frac{61}{10} = 6 \frac{1}{10} \end{aligned}

Ответ: 6 \frac{1}{10}

3)

\begin{aligned} &\frac{2 \frac{3}{8} : \frac{3}{4} + 24 \frac{7}{9}}{7 \frac{1}{8} - 157 \frac{4}{5} : 24} = \frac{\frac{19}{8} : \frac{3}{4} + \frac{223}{9}}{\frac{57}{8} - \frac{789}{5} : 24} = \frac{\frac{19}{8} \cdot \frac{4}{3} + \frac{223}{9}}{\frac{57}{8} - \frac{789}{5 \cdot 24}} = \frac{\frac{19}{2} \cdot \frac{1}{3} + \frac{223}{9}}{\frac{57}{8} - \frac{263}{40}} = \frac{\frac{19}{6} + \frac{223}{9}}{\frac{285 - 263}{40}} = \frac{\frac{57 + 446}{18}}{\frac{22}{40}} = \frac{\frac{503}{18}}{\frac{11}{20}} = \frac{503}{18} \cdot \frac{20}{11} = \frac{503}{9} \cdot \frac{10}{11} = \frac{5030}{99} = 50 \frac{80}{99} \end{aligned}

Ответ: 50 \frac{80}{99}

4)

\begin{aligned} &\frac{(1 \frac{1}{2} + 2 \frac{2}{3} + 3 \frac{3}{4}) \cdot 3 \frac{3}{5}}{14 - 15 \frac{1}{8} : 2 \frac{1}{5}} = \frac{(\frac{3}{2} + \frac{8}{3} + \frac{15}{4}) \cdot \frac{18}{5}}{14 - \frac{121}{8} : \frac{11}{5}} = \frac{\frac{18 + 32 + 45}{12} \cdot \frac{18}{5}}{14 - \frac{121}{8} \cdot \frac{5}{11}} = \frac{\frac{95}{12} \cdot \frac{18}{5}}{14 - \frac{11}{8} \cdot 5} = \frac{\frac{19}{2} \cdot \frac{3}{1}}{14 - \frac{55}{8}} = \frac{\frac{57}{2}}{\frac{112 - 55}{8}} = \frac{\frac{57}{2}}{\frac{57}{8}} = \frac{57}{2} \cdot \frac{8}{57} = 4 \end{aligned}

Ответ: 4