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huonghiena7
2 năm trước
Cho tam giác ABC , vẽ trung tuyến BM . trên tia BM lấy hai điểm G, K , sao cho BG = 2/3 BM . G là trung điểm của BK . gọi N là trung điểm của KC . GN cắt CM ở O . CM a, O là trọng tâm của Gk b, GO = 1/3 BC
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