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2. Cho phương trình x^2 – 2(m + 1) x + m^2+ 4 = 0 (m là tham số) Tìm m để phương trình có hai nghiệm x1, x2 thỏa mãn : x1^2 + 2(m+1).x2 ≤ 3m^2 +16
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