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cho tam giác ABC cân tại C có số đo góc A bằng 60. lấy các điểm D,E,F theo thứ từ thuộc các cạnh AB,BC, CA sao cho AD=BE=CF. Tam giác DE là tam giác gì? vì sao? giúp mik với ạ mik cảm ơn nhiều.
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