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Câu hỏi: Cho \(A = \left\{ {x \in \mathbb{N}| x < 7} \right\},\) \( B = \left\{ {1;2;3;6;7;8} \right\}\). Xác định các tập hợp sau:
\(A \cup B, A \cap B, A {\rm{\backslash }} B\)
\(A \cup B, A \cap B, A {\rm{\backslash }} B\)
Lời giải chi tiết
\(A = \left\{ {0;1;2;3;4;5;6} \right\}\)
\( B = \left\{ {1;2;3;6;7;8} \right\}\)
Vậy
\(A \cap B = \left\{ {1;2;3;6} \right\}\)
\(A \cup B = \left\{ {0;1;2;3;4;5;6;7;8} \right\} = \left\{ {x \in \mathbb{N}| x < 9} \right\}\)
\(A {\rm{\backslash }} B = \left\{ {0;4;5} \right\}\)
\(A = \left\{ {0;1;2;3;4;5;6} \right\}\)
\( B = \left\{ {1;2;3;6;7;8} \right\}\)
Vậy
\(A \cap B = \left\{ {1;2;3;6} \right\}\)
\(A \cup B = \left\{ {0;1;2;3;4;5;6;7;8} \right\} = \left\{ {x \in \mathbb{N}| x < 9} \right\}\)
\(A {\rm{\backslash }} B = \left\{ {0;4;5} \right\}\)
