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viclu0812
2 năm trước
Bài 52. (Chứng minh tính chất của tam giác đều). Cho tam giác đều DEF. tính số đo môi góc của ADEF và có nhận xét gì về 3 trung tuyến, 3 đường phân giác, 3, đưong cao của ADEF?
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