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anhlun51119999
1 năm trước
Cho tam giác đều ABC có độ dài AB = a. Gọi I là trung điểm của BC; lấy M thuộc cạnh AB và N thuộc cạnh AC sao cho góc MIN = 60 độ a) Tính tích BM.CN theo a. b) Chminh MI là phân giác của góc BMN
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