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Chứng minh rằng mỗi phương trình sau có nghiệm với mọi giá trị của m. a/ x 2 -2(m-1)x +m -5 =0 b/ x 2 -2mx + 2m -1 =0 c/ x 2 -2mx - m -4 =0 d/ x 2 + 2(m-2)x -4=0
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