3. Найдите значение выражения: 1) -34+67+(-19)+(-44)+34; 2) 6+(-7)-(-15)-(-6)-30; 3) 3\frac{1}{6}+(-2\frac{5}{9})-(-1\frac{7}{12}).

1) \(-34 + 67 + (-19) + (-44) + 34 = -34 + 67 - 19 - 44 + 34 = (67+34) + (-34-19-44) = 101 - (34 + 19 + 44) = 101 - 97 = 4\) 2) \(6 + (-7) - (-15) - (-6) - 30 = 6 - 7 + 15 + 6 - 30 = (6 + 15 + 6) - (7 + 30) = 27 - 37 = -10\) 3) \(3\frac{1}{6} + (-2\frac{5}{9}) - (-1\frac{7}{12}) = 3\frac{1}{6} - 2\frac{5}{9} + 1\frac{7}{12} = 3\frac{6}{36} - 2\frac{20}{36} + 1\frac{21}{36} = 3\frac{6}{36} + 1\frac{21}{36} - 2\frac{20}{36} = 4\frac{27}{36} - 2\frac{20}{36} = 2\frac{7}{36}\)