6) 1/3+(-1/2);

6) $$\frac{1}{3} + (-\frac{1}{2}) = \frac{1}{3} - \frac{1}{2} = \frac{1 \cdot 2}{3 \cdot 2} - \frac{1 \cdot 3}{2 \cdot 3} = \frac{2}{6} - \frac{3}{6} = \frac{2 - 3}{6} = -\frac{1}{6}$$

Ответ: $$\frac{-1}{6}$$