2. Вычислите: a) -$$\frac{2}{3}$$ - $$\frac{1}{6}$$; б) -$$\frac{3}{8}$$ + $$\frac{1}{2}$$; в) $$\frac{1}{3}$$ - $$\frac{2}{5}$$; д) -$$\frac{15}{22}$$ : (-$$\frac{5}{11}$$)

Решение: a) -$$\frac{2}{3}$$ - $$\frac{1}{6}$$ = -$$\frac{4}{6}$$ - $$\frac{1}{6}$$ = -$$\frac{5}{6} б) -$$\frac{3}{8}$$ + $$\frac{1}{2}$$ = -$$\frac{3}{8}$$ + $$\frac{4}{8}$$ = $$\frac{1}{8} в) $$\frac{1}{3}$$ - $$\frac{2}{5}$$ = $$\frac{5}{15}$$ - $$\frac{6}{15}$$ = -$$\frac{1}{15} д) -$$\frac{15}{22}$$ : (-$$\frac{5}{11}$$) = $$\frac{15}{22}$$ * $$\frac{11}{5}$$ = $$\frac{3}{2}$$ * $$\frac{1}{1}$$ = $$\frac{3}{2}$$ = 1$$\frac{1}{2}$$ Ответ: a) -$$\frac{5}{6}$$ б) $$\frac{1}{8}$$ в) -$$\frac{1}{15}$$ д) 1$$\frac{1}{2}$$