Trong các khẳng định sau, khẳng định nào đúng?
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
- $\mathbb{R}$ là tập hợp các số thực.
- $\mathbb{Q}$ là tập hợp các số hữu tỉ.
- $\mathbb{N}$ là tập hợp các số tự nhiên.
- $\mathbb{Z}$ là tập hợp các số nguyên.
- $\mathbb{N}^*$ là tập hợp các số tự nhiên khác 0.
Xét các đáp án:
- Đáp án A: $\mathbb{R} \backslash \mathbb{Q}$ là tập hợp các số vô tỉ, khác với $\mathbb{N}$. Vậy A sai.
- Đáp án B: $\mathbb{N}^* \cap \mathbb{Q} = \mathbb{N}^*$ đúng vì tất cả các số tự nhiên khác 0 đều là số hữu tỉ.
- Đáp án C: $\mathbb{N}^* \cap \mathbb{Z} = \mathbb{N}^* \neq \mathbb{Z}$. Vậy C sai.
- Đáp án D: $\mathbb{N}^* \cup \mathbb{N} = \mathbb{N} \neq \mathbb{Z}$. Vậy D sai.
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