ГДЗ по алгебре и начала математического анализа 10 класс Колягин Задание 226

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\[1) - 1 \leq x \leq 2\]

\[\overline{p}:\ \ \ \left\lbrack \begin{matrix} x < - 1 \\ x > 2\ \ \ \\ \end{matrix}. \right.\ \]

\[2)\ x \in ( - \infty;4) \cup (5; + \ \infty)\]

\[\overline{p}:\ \ \ 4 \leq x \leq 5.\]

\[3) - x^{2} - 3x + 4 = 0\]

\[x^{2} + 3x + 4 = 0\]

\[x_{1} + x_{2} = - 3;\ \ \ x_{2} = 4\]

\[x_{1} = - 4;\ \ \ x_{2} = 1.\]

\[\overline{p}:x \in ( - \infty; - 4) \cup ( - 4;1) \cup (1; + \infty).\]

\[4)\ x^{2} + 1 \leq 0\]

\[\overline{p}:\ \ x^{2} + 1 > 0 \rightarrow x \in R.\]