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Duong14012000
2 năm trước
Cho phương trình mx^2-2(m-1)x +m-3=0(m là tham số).Tìm giá trị m để phương trình: a)Có 2 nghiệm phân biệt b)Có nghiệm kép c)Vô nghiệm d)Có đúng 1 nghiệm e)Có nghiệm
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