Ответ:

173. Сложение рациональных чисел

  1. \(-10 + 7 = -3\)

  2. \(-4,6 + 6,3 = 1,7\)

  3. \(13,8 + (-5,2) = 13,8 - 5,2 = 8,6\)

  4. \(7,14 + (-12,4) = 7,14 - 12,4 = -5,26\)

  5. \(-4,8 + 4,8 = 0\)

  6. \(-1 + 0,329 = -0,671\)

  7. \(-\frac{5}{14} + \frac{7}{10} = -\frac{5 \times 5}{14 \times 5} + \frac{7 \times 7}{10 \times 7} = -\frac{25}{70} + \frac{49}{70} = \frac{49 - 25}{70} = \frac{24}{70} = \frac{12}{35}\)

  8. \(4\frac{2}{7} + (-\1\frac{4}{5}) = 4\frac{2}{7} - 1\frac{4}{5} = \frac{30}{7} - \frac{9}{5} = \frac{30 \times 5}{7 \times 5} - \frac{9 \times 7}{5 \times 7} = \frac{150}{35} - \frac{63}{35} = \frac{150 - 63}{35} = \frac{87}{35} = 2\frac{17}{35}\)

  9. \(-6\frac{5}{6} + 3\frac{5}{8} = -(\frac{36+5}{6}) + \frac{24+5}{8} = -\frac{41}{6} + \frac{29}{8} = -\frac{41 \times 4}{6 \times 4} + \frac{29 \times 3}{8 \times 3} = -\frac{164}{24} + \frac{87}{24} = \frac{87 - 164}{24} = -\frac{77}{24} = -3\frac{5}{24}\)