Cho ΔABC vuông tại A và AB > AC. Gọi D là trung điểm của BC. Từ D kẻ tia Dx vuông góc với BC cắt AB tại E và AC tại F. 1/ Kéo dài CE cắt BF tại N. Gọi H, I, K, M lần lượt là hình chiếu của điểm A trên BF, DF, CN, BC. Chứng minh 4 điểm H, I, K, M thẳng hàng. Giúp mình nha! Cảm ơn

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