4. Найдите значение выражений:

1) \(3 \div \frac{1}{8} - 1 \frac{1}{2} \cdot 7 = 3 \cdot 8 - \frac{3}{2} \cdot 7 = 24 - \frac{21}{2} = 24 - 10.5 = 13.5\) 2) \(3 \div 3 \frac{3}{4} + 2 \frac{1}{2} \cdot 1 \frac{2}{5} - 3 \frac{5}{6} = 3 \div \frac{15}{4} + \frac{5}{2} \cdot \frac{7}{5} - \frac{23}{6} = 3 \cdot \frac{4}{15} + \frac{7}{2} - \frac{23}{6} = \frac{4}{5} + \frac{21}{6} - \frac{23}{6} = \frac{4}{5} + \frac{-2}{6} = \frac{4}{5} - \frac{1}{3} = \frac{12 - 5}{15} = \frac{7}{15}\) 3) \((4 \div \frac{5}{12} + 1 \frac{1}{3}) \div (6 \frac{2}{15} - 1 \frac{1}{5}) = (4 \cdot \frac{12}{5} + \frac{4}{3}) \div (\frac{92}{15} - \frac{6}{5}) = (\frac{48}{5} + \frac{4}{3}) \div (\frac{92}{15} - \frac{18}{15}) = (\frac{144 + 20}{15}) \div \frac{74}{15} = \frac{164}{15} \cdot \frac{15}{74} = \frac{164}{74} = \frac{82}{37}\) 4) \(2 \frac{2}{3} \cdot (2 \frac{1}{2} + 2 \frac{2}{15}) - 8 \frac{4}{5} = \frac{8}{3} \cdot (\frac{5}{2} + \frac{32}{15}) - \frac{44}{5} = \frac{8}{3} \cdot (\frac{75+64}{30}) - \frac{44}{5} = \frac{8}{3} \cdot \frac{139}{30} - \frac{44}{5} = \frac{4}{3} \cdot \frac{139}{15} - \frac{44}{5} = \frac{556}{45} - \frac{396}{45} = \frac{160}{45} = \frac{32}{9}\) 5) \((5 \frac{3}{7} \cdot \frac{5}{8} - 5 \frac{1}{4} \div 7) \div 3 \div (3 + 3 \frac{3}{28} - 2 \frac{1}{2}) = ((\frac{38}{7} \cdot \frac{5}{8} - \frac{21}{4} \div 7) \div 3 + 3 \frac{3}{28} - 2 \frac{1}{2}) = ((\frac{190}{56} - \frac{21}{4} \cdot \frac{1}{7}) \div 3 + \frac{87}{28} - \frac{5}{2}) = ((\frac{95}{28} - \frac{3}{4}) \div 3 + \frac{87}{28} - \frac{70}{28}) = ((\frac{95 - 21}{28}) \div 3 + \frac{17}{28}) = (\frac{74}{28} \div 3 + \frac{17}{28}) = (\frac{37}{14} \cdot \frac{1}{3} + \frac{17}{28}) = (\frac{37}{42} + \frac{17}{28}) = \frac{74+51}{84} = \frac{125}{84}\)