Решение:
1. -\frac{6}{8} + 2\frac{3}{4} = -\frac{3}{4} + 2\frac{3}{4} = 2\frac{3}{4} - \frac{3}{4} = 2.
2. 4298 : (-1400) = -\frac{4298}{1400} = -\frac{2149}{700}.
3. Вычислим -\frac{2149}{700} и - 3\frac{49}{200}. -3\frac{49}{200} = -3\frac{49 \cdot 7}{200 \cdot 7} = -3\frac{343}{1400}.
4. 2 - (-\frac{2149}{700}) - 3\frac{49}{200} = 2 + \frac{2149}{700} - 3\frac{343}{1400} = 2 + \frac{2149 \cdot 2}{700 \cdot 2} - 3\frac{343}{1400} = 2 + \frac{4298}{1400} - 3\frac{343}{1400} = 2 + \frac{4298}{1400} - \frac{3 \cdot 1400 + 343}{1400} = 2 + \frac{4298}{1400} - \frac{4200 + 343}{1400} = 2 + \frac{4298 - 4543}{1400} = 2 + \frac{-245}{1400} = 2 - \frac{245}{1400} = 2 - \frac{49}{280} = 2 - \frac{7}{40} = \frac{80}{40} - \frac{7}{40} = \frac{73}{40} = 1\frac{33}{40}.
Ответ: 1\frac{33}{40}.
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