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letruong098123
2 năm trước
CÂU 1:Phương trình: x2 + 2(m + 1)x + m2 - 5m + 6 = 0 có hai nghiệm trái dấu khi và chỉ khi? CÂU 2: Với giá trị nào của m thì phương trình:(m2-4)x2+5x+m=0 có 2 nghiệm trái dấu? CÂU 3: Tập nghiệm của bất phương trình x + √(x-2) ≤2+ √(x-2)..................................................................
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