cho parabol (P):y=1/2x2 và đường thẳng (d):y=2x-m tìm m để a. đường thẳng (d) tiếp xúc với parabol(P) b. đường thẳng (d) cắt parabol (P) tại hai điểm phân biệt c. đường thẳng (d) và parabol(P) không có điểm chung

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