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Linh_1708
2 năm trước
cho pt x^2 + 2(m-1)x + 4m-11 = 6 CMR pt luôn có 2 nghiệm pb với mọi m . tìm m để các nghiệm đó TM hệ thức : 2(x1-1)^2 + (6-x2)(x1x2 + 11) = 72
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