mn khum thấy rõ thì hỏi lại nha ạ câu 1 ; tìm x biết a: √x-1 >2 b: √4-x \< (bé hơn hoặc bằng) 5 câu 2: tìm gtnn a: √x^2+4x+5 b: √x^2+2x+5

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