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thachtthao0101
2 năm trước
Tìm điều kiện của m để phương trình: x^2 + 2( m + 1)x + m^2=0 a) Có hai nghiệm phân biệt b) Có nghiệm kép, tìm nghiệm kép đó c) Vô nghiệm
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