\[\boxed{\text{269\ (269).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[f(x) = \left\{ \begin{matrix} \frac{4}{x},\ \ x < - 1\ \ \ \ \ \ \ \ \\ \frac{x}{4},\ \ - 1 \leq x \leq 1 \\ \frac{4}{x},\ \ x > 1\ \ \ \ \ \ \ \ \ \ \ \\ \end{matrix} \right.\ \]
\[y = \frac{4}{x}\]
\[x\] | \[1\] | \[2\] | \[4\] | \[- 1\] | \[- 2\] | \[- 4\] |
---|---|---|---|---|---|---|
\[y\] | \[4\] | \[2\] | \[1\] | \[- 4\] | \[- 2\] | \[- 1\] |
\[y = \frac{x}{4}\]
\[x\] | \[0\] | \[8\] |
---|---|---|
\[y\] | \[0\] | \[2\] |
\[нули\ функции:x = 0.\]
\[f(x) > 0\ на\ (0;\ + \infty).\]
\[f(x) < 0\ на\ ( - \infty;0).\]
\[возрастает\ на\ \lbrack - 1;1\rbrack.\]
\[убывает\ на\ ( - \infty;\ - 1)\ и\ \]
\[(1;\ + \infty)\text{.\ }\]