Ответ:
\[y = \frac{4}{x}\]
| \[x\] | \[- 4\] | \[- 2\] | \[- 1\] | \[1\] | \[2\] | \[4\] |
|---|---|---|---|---|---|---|
| \[y\] | \[- 1\] | \[- 2\] | \[- 4\] | \[4\] | \[2\] | \[1\] |

\[D(y) = ( - \infty;0) \cup (0; + \infty).\]
\[y = \frac{4}{x}\]
| \[x\] | \[- 4\] | \[- 2\] | \[- 1\] | \[1\] | \[2\] | \[4\] |
|---|---|---|---|---|---|---|
| \[y\] | \[- 1\] | \[- 2\] | \[- 4\] | \[4\] | \[2\] | \[1\] |

\[D(y) = ( - \infty;0) \cup (0; + \infty).\]