\[- 1\frac{2}{3} + \frac{1}{6} = - \frac{5^{\backslash 2}}{3} + \frac{1}{6} = - \frac{10}{6} + \frac{1}{6} =\]
\[= - \frac{9}{6} = - \frac{3}{2} = - 1,5\]
\[1,6 > - 1,5 \Longrightarrow - 1\frac{2}{3} + \frac{1}{6} < 1,6.\]