**Решение:**
1) -14 + 6 = -8
2) -5,9 + 6,7 = 0,8
3) 17,8 + (-9,4) = 17,8 - 9,4 = 8,4
4) 5,26 + (-14,6) = 5,26 - 14,6 = -9,34
5) -9,9 + 9,9 = 0
6) -1 + 0,681 = -0,319
7) -\frac{3}{16} + \frac{5}{12} = -\frac{9}{48} + \frac{20}{48} = \frac{11}{48}
8) 6 \frac{1}{6} + (-2 \frac{2}{7}) = 6 \frac{1}{6} - 2 \frac{2}{7} = 6 \frac{7}{42} - 2 \frac{12}{42} = 5 \frac{49}{42} - 2 \frac{12}{42} = 3 \frac{37}{42}
9) -8 \frac{3}{8} + 2 \frac{1}{6} = -8 \frac{9}{24} + 2 \frac{4}{24} = -(8 \frac{9}{24} - 2 \frac{4}{24}) = -(6 \frac{5}{24}) = -6 \frac{5}{24}
**Ответы:**
1) -8
2) 0,8
3) 8,4
4) -9,34
5) 0
6) -0,319
7) \frac{11}{48}
8) 3 \frac{37}{42}
9) -6 \frac{5}{24}