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vampirequeen2411
2 năm trước
Cho tam giác ABC đều có cạnh bằng 1. Dựng ra bên ngoài tam giác ABC tam giác BDC cân tại D và BDC = 120 . Gọi M, N là hai điểm thuộc cạnh AB, AC tương ứng sao cho MDN = 60 . Tính chu vi tam giác AMN.
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