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ngocbichvu
2 năm trước
Cho tam giác ABC, AM là trung tuyến. Vẽ đường thẳng d đi qua trung điểm I của AM cắt AB và AC. Gọi A', B', C' là hình chiếu vuông góc của A, B, C trên đường thẳng d. C/m AA'=(BB'+CC')/2
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