Вычислите значение числового выражения: 1) $$14\frac{7}{15}-3\frac{3}{23}\cdot\frac{23}{27}-1\frac{1}{5}\cdot\frac{1}{6}$$; 2) $$(5\frac{8}{9}:1\frac{17}{36}+1\frac{1}{4})\cdot\frac{5}{21}$$; 3) $$(-3,25 - 2,75) : (-0,6) + 0,8 \cdot (-7)$$; 4) $$(-1\frac{3}{8}-2\frac{5}{12}):5\frac{5}{12}$$.

1) $$14\frac{7}{15}-3\frac{3}{23}\cdot\frac{23}{27}-1\frac{1}{5}\cdot\frac{1}{6} = \frac{217}{15} - \frac{72}{23} \cdot \frac{23}{27} - \frac{6}{5} \cdot \frac{1}{6} = \frac{217}{15} - \frac{8}{3} - \frac{1}{5} = \frac{217}{15} - \frac{40}{15} - \frac{3}{15} = \frac{217-40-3}{15} = \frac{174}{15} = \frac{58}{5} = 11\frac{3}{5}$$; 2) $$(5\frac{8}{9}:1\frac{17}{36}+1\frac{1}{4})\cdot\frac{5}{21} = (\frac{53}{9}:\frac{53}{36}+\frac{5}{4})\cdot\frac{5}{21} = (\frac{53}{9}\cdot\frac{36}{53}+\frac{5}{4})\cdot\frac{5}{21} = (4+\frac{5}{4})\cdot\frac{5}{21} = \frac{21}{4}\cdot\frac{5}{21} = \frac{5}{4} = 1\frac{1}{4}$$; 3) $$(-3,25 - 2,75) : (-0,6) + 0,8 \cdot (-7) = -6 : (-0,6) + 0,8 \cdot (-7) = 10 - 5,6 = 4,4$$; 4) $$(-1\frac{3}{8}-2\frac{5}{12}):5\frac{5}{12} = (-\frac{11}{8} - \frac{29}{12}) : \frac{65}{12} = (\frac{-33-58}{24}) : \frac{65}{12} = \frac{-91}{24} : \frac{65}{12} = \frac{-91}{24} \cdot \frac{12}{65} = \frac{-91}{2} \cdot \frac{1}{65} = \frac{-7}{2} \cdot \frac{1}{5} = -\frac{7}{10} = -0,7$$