\[\boxed{\text{39\ (39).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\]
\(б)\ \)
\[\textbf{в)}\]
\(\ \)
\[\boxed{\text{39.\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\frac{1}{7} \approx 0,14\]
\[\left| \frac{1}{7} - 0,14 \right| = \left| \frac{1}{7} - \frac{14}{100} \right| =\]
\[= \left| \frac{100 - 98}{700} \right| = \frac{2}{700} = \frac{1}{350}\]
\[Ответ:\ \frac{1}{350}.\]