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Topic
Given the set \(A = \left[ { – 1; + \infty } \right)\). Tập hợp \({C_\mathbb{R}}A\) bằng:
A. \(\left( { – 1; + \infty } \right)\)
B. \(\left( { – \infty ; – 1} \right)\)
C. \(\left( { – \infty ; – 1} \right]\)
D. \(\mathbb{R}\backslash \left\{ { – 1} \right\}\)
Solution method – See details
\({C_\mathbb{R}}A = \{ x \in \mathbb{R}|x \notin A\} \)
Detailed explanation
\({C_{\mathbb R}}A = \mathbb R{\rm{\backslash }}[1;+\infty)=\left({–\infty;–1}\right)\)[1;+\infty)=\left({–\infty;–1}\right)\)
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