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thientinh2093
2 năm trước
cho tam giác ABC gọi D và E theo thứ tự là trung điểm của AB và AC. Trên tia DE lấy điểm F sao cho DE=EF CMR: a) BD=CF b) tam giác BCD= tam giác FDC c) DE// BC và DE=1/2 BC
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