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khanhvy88
2 năm trước
Giusp với, có hỏi r nhưng toàn spam mà chưa xóa cho tam giác abc cân tại a. M là 1 điểm thay đổi trên tia đối tia BC. Vẽ ME vuông góc AB tại E. MF vuông góc với AC tại F. C/m MF-ME luôn ko đổi
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