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nguyenhuychung84
2 năm trước
cho pt x^2-2mx+m-1=0 a)CMR:pt luôn có 2 ngo Pb b)Tìm m thỏa mãn biểu thức A= (x1-x2)^2-x1x2 c)Tìm m để biểu thức A đạt GTNN
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