Решебник по алгебре 8 класс Макарычев ФГОС Задание 1244

\[\boxed{\text{1244.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]

\[y = \left\{ \begin{matrix} x;\ \ \ \ \ \ \ x \leq 0 \\ x^{- 1};\ \ x > 0 \\ \end{matrix} \right.\ ;\ \]

\[\ y = \left\{ \begin{matrix} x,\ \ x \leq 0\ \ (1) \\ \frac{1}{x},\ \ x > 0\ (2) \\ \end{matrix} \right.\ \]

\[1)\]

\[2)\]

\[\textbf{а)}\ x = - 2:\ \ y = x \Longrightarrow y = - 2,\]

\[\ \ x \leq 0\]

\[x = 2:\ \ y = \frac{1}{x} \Longrightarrow y = \frac{1}{2},\]

\[\ \ x > 0\]

\[\textbf{б)}\ y = - 4:\ \ \ y = x \Longrightarrow x = - 4,\ \]

\[\ x \leq 0\]

\[y = 4:\ \ \ y = \frac{1}{x} \Longrightarrow x = \frac{1}{4},\]

\[\ \ x > 0.\]