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tuelam43
2 năm trước
cho tam giác ABC cân đỉnh A. Trên cạnh AB lấy điểm D, trên tia đối của tia CA lấy điểm E sao cho BD=CE. Nối D với E. Gọi I là trung điểm của DE. Chứng minh 3 điểm B, I, C thẳng hàng.
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