Сложите почленно неравенства: -1 1/3<-1 1/6 и 2/3<1.

\[- 1\frac{1}{3} < - 1\frac{1}{6}\ \ и\ \ \frac{2}{3} < 1\]

\[+ \left| \begin{matrix}
- 1\frac{1}{3} < - 1\frac{1}{6} \\
\ \frac{2}{3} < 1 \\
\end{matrix} \right.\ \]

\[\text{\ \ \ \ \ }\overline{\ \ - \frac{2}{3} < - \ \frac{1}{6}\text{\ \ \ \ \ \ }}\]