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hientran510
2 năm trước
Cho tam giác ABC đều trên cạnh AB lấy điểm E, trên cạnh AC lấy điểm F, trên cạnh BC lấy điểm P sao cho BE=AP=PC.Chứng minh tam giác EFP là tam giác đều Giúp với ạ~
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