1. A) 12,67 + (−13,2 – 5,67) Б) -(- 8,05 + 3,9) (-4,95 + 2,8) B) $$-(2\frac{1}{3} +10\frac{5}{7})-(-9\frac{3}{14}+2\frac{11}{6})$$ Г) $$-5\frac{5}{6}+(3,5-4\frac{1}{6})$$

Решение: А) $$12,67 + (-13,2 - 5,67) = 12,67 + (-18,87) = -6,2$$ Б) $$-(-8,05 + 3,9) - (-4,95 + 2,8) = -(-4,15) - (-2,15) = 4,15 + 2,15 = 6,3$$ В) $$-(2\frac{1}{3} +10\frac{5}{7})-(-9\frac{3}{14}+2\frac{11}{6}) = -(\frac{7}{3} + \frac{75}{7}) - (-\frac{129}{14} + \frac{23}{6}) = -(\frac{49+225}{21}) - (\frac{-387 + 161}{42}) = -\frac{274}{21} - (\frac{-226}{42}) = -\frac{274}{21} + \frac{113}{21} = -\frac{161}{21} = -7\frac{14}{21} = -7\frac{2}{3}$$ Г) $$-5\frac{5}{6}+(3,5-4\frac{1}{6}) = -5\frac{5}{6} + (3\frac{1}{2}-4\frac{1}{6}) = -5\frac{5}{6} + (\frac{7}{2} - \frac{25}{6}) = -5\frac{5}{6} + (\frac{21}{6} - \frac{25}{6}) = -5\frac{5}{6} - \frac{4}{6} = -5\frac{9}{6} = -6\frac{3}{6} = -6\frac{1}{2} = -6,5$$ Ответ: АБВГ