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Cho tam giác ABC nhọn có BN, CM là hai đường trung tuyến cắt nhau tại G.(Vẽ hình) a) Cho BC = 14 cm. Tính MN. b) Gọi E, F lần lượt là trung điểm BG, GC. Chứng minh : EF// BC, MN = EF
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