Solution 24 Page 14 Math Workbook 10 – Kite>

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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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