Mathematics, 10.10.2021 09:40 michealsfamily
Cho tam giác ABC có các đường cao BD và CE. Trên cạnh AC lấy điểm M. Kẻ tia Cx vuông góc với tia BM tại F. Chứng minh 5 điểm B, C, D, E, F cùng thuộc một đường tròn.
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Cho tam giác ABC có các đường cao BD và CE. Trên cạnh AC lấy điểm M. Kẻ tia Cx vuông góc với tia
B...
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