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Mathematics, 23.06.2021 17:00 Svetakotok

2. Cho tam giác ABC. Các trung tuyến BM, CN cắt nhau tại G. Gọi I, K lần lượt là trung ​điểm của BG và CG. Chứng minh rằng IKMN là hình bình hành (Giải bằng 3 cách)

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2. Cho tam giác ABC. Các trung tuyến BM, CN cắt nhau tại G. Gọi I, K lần lượt là trung ​điểm của BG...
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