Đáp án:
d) \(\left\{ \begin{array}{l}
x \ne 1\\
x \ge - 1
\end{array} \right.\)
Giải thích các bước giải:
\(\begin{array}{l}
a)DK:\left\{ \begin{array}{l}
x \ge 0\\
x + 1 \ne 0\\
x - 2 \ne 0
\end{array} \right.\\
\to \left\{ \begin{array}{l}
x \ge 0\\
x \ne 2
\end{array} \right.\\
c)DK:\left\{ \begin{array}{l}
x - 2 \ne 0\\
x + 1 \ne 0
\end{array} \right.\\
\to x \ne \left\{ { - 1;2} \right\}\\
b)DK:\left\{ \begin{array}{l}
x + 5 \ge 0\\
1 - x > 0
\end{array} \right.\\
\to 1 > x \ge - 5\\
d)DK:\left\{ \begin{array}{l}
x - 1 \ne 0\\
x + 1 \ge 0
\end{array} \right.\\
\to \left\{ \begin{array}{l}
x \ne 1\\
x \ge - 1
\end{array} \right.
\end{array}\)
