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Câu 21:

Cho hai tập hợp $B=\mathbb{R} \backslash(0 ;+\infty)$

Câu 21: Cho hai tập hợp B=R\(0;+∞)B=\mathbb{R} \backslash(0 ;+\infty)B=R\(0;+∞).Khi đó tập hợp B là

Thông tin câu hỏi

Câu 21:

Cho hai tập hợp $B=\mathbb{R} \backslash(0 ;+\infty)$ .Khi đó tập hợp B là