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Cho phương trình (m-2)x²-2mx+m-3. Tìm m để phương trình A) CÓ 2 nghiệm phân biệt B) có 2 nghiệm trái dấu C) có 2 nghiệm cùng dấu D) có 2 nghiệm cùng dương E) có 2 nghiệm cùng âm
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