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luonganhtho
2 năm trước
Cho tam giác ABC, đường trung tuyến AM. Qua điểm D nằm trên cạnh BC, vẽ đường thẳng song song với AM cắt AB, AC lần lượt tại E, F. a. CMR: DE + DF = 2AM. b. Đường thẳng qua A song song với BC cắt EF tại N. CMR: N là trung điểm của EF.
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