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Nguyenvantuan2019
2 năm trước
Mệnh đề sau đúng hay sai ? Vì sao ? a) Tồn tại x ∈ R , $\frac{4x}{x^{2} +1}$ >2 b) Tồn tại y ∈ Q : $\frac{3y-2}{2y^{2} +1}$ ∈ Z
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