173. Выполните сложение: 1) -12 + 5; 2) -3,8 + 5,3; 3) 14,6 + (-6,4); 4) 8,19 + (-15,6); 5) -7,9 + 7,9; 6) -1 + 0,546; 7) -7/12 + 9/10; 8) 5 2/9 + (-2 3/4); 9) -5 3/8 + 4 9/10

173. Решение: 1) \(-12 + 5 = -7\) 2) \(-3.8 + 5.3 = 1.5\) 3) \(14.6 + (-6.4) = 14.6 - 6.4 = 8.2\) 4) \(8.19 + (-15.6) = 8.19 - 15.6 = -7.41\) 5) \(-7.9 + 7.9 = 0\) 6) \(-1 + 0.546 = -0.454\) 7) \(-\frac{7}{12} + \frac{9}{10} = -\frac{35}{60} + \frac{54}{60} = \frac{19}{60}\) 8) \(5\frac{2}{9} + (-2\frac{3}{4}) = 5\frac{8}{36} - 2\frac{27}{36} = 4\frac{44}{36} - 2\frac{27}{36} = 2\frac{17}{36}\) 9) \(-5\frac{3}{8} + 4\frac{9}{10} = -5\frac{15}{40} + 4\frac{36}{40} = -4\frac{55}{40} + 4\frac{36}{40} = -\frac{19}{40}\)