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cho pt x^2 - 4x + m + 1 = 0 ( 1 ) a) Giải pt ( 1 ) khi m = 2 b) Tìm giá trị của m để pt ( 1 ) thoả mãn đẳng thức x1^2 + x2^2 = 5 ( x1 + x2 )
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