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heheboi
2 năm trước
Cho tam giác ABC . Trên cạnh AB lấy điểm D , trên cạnh AC lấy điểm E . Gọi M, N lần lượt là trung điểm của BE và CD . Đường thẳng MN cắt tia AB và AC lần lượt là tại P và Q . Hỏi hai điểm D và E phải có điều kiện gì để tam giác APQ cân tại A ?
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