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2 năm trước
Cho tam giác ABC cân tại a, trên cạnh AB,AC lấy lần lượt 2 điểm E,F biết BE=1/2AE, CF=1/2AF a) Tính độ dài EF biết BC//EF, BC= 12cm b) Từ E kẻ trung tuyến EM, vẽ điểm O đối xứng với E qua B. C/m: EM//DF
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