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Lyly05
2 năm trước
Cho tam giác ABC có AB < AC. Gọi Ax là tia phân giác của góc A. Qua trung điểm M của BC, kẻ đường thẳng vuông góc với Ax, cắt các đường thẳng AB và AC theo thứ tự ở D và E.
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