Cho hai tập hợp \(A = \left[ { - 5;1} \right]\) và \(B = \left( { - 3;2} \right)\).
a) \(A \cup B = \left[ { - 3;2} \right)\).
b) \(A \cap B = \left( { - 3;2} \right]\).
c) \(A\backslash B = \left[ { - 5; - 3} \right]\).
d) \({C_\mathbb{R}}\left( {A \cup B} \right) = \left( { - \infty ; - 5} \right) \cup \left[ {1; + \infty } \right).\)
Cho hai tập hợp \(A = \left[ { - 5;1} \right]\) và \(B = \left( { - 3;2} \right)\).
a) \(A \cup B = \left[ { - 3;2} \right)\).
b) \(A \cap B = \left( { - 3;2} \right]\).
c) \(A\backslash B = \left[ { - 5; - 3} \right]\).
d) \({C_\mathbb{R}}\left( {A \cup B} \right) = \left( { - \infty ; - 5} \right) \cup \left[ {1; + \infty } \right).\)
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
- $A = [-5; 1] = \{x \in \mathbb{R} | -5 \le x \le 1\}$
- $B = (-3; 2) = \{x \in \mathbb{R} | -3 < x < 2\}$
- $A \cup B = [-5; 2)$
- $A \cap B = (-3; 1]$
- $A \backslash B = [-5; -3]$
- $A \cup B = [-5; 2) \Rightarrow C_{\mathbb{R}}(A \cup B) = (-\infty; -5) \cup [2; +\infty)$
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