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(d) : y = mx + m + 1 (P) : y = x^2 tìm m để đt (d) cắt parabol (P) tại 2 điểm phân biệt có hoành độ x1 x2 sao cho $\frac{1}{x1}$ + $\frac{1}{x2}$ = $\frac{-1}{2}$
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