\[\boxed{\text{239\ (239).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[p = \frac{10}{x}\]
\[если\ \ x = - 5:\ \]
\[p = - \frac{10}{5} = - 2.\]
\[если\ x = 1:\ \ \]
\[p = \frac{10}{1} = 10.\]
\[если\ x = 20:\ \ \]
\[p = \frac{10}{20} = 0,5.\]