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trongtam.100902
2 năm trước
cho tam giác ABC nhọn có (AB nhỏ hơn AC). Lấy điểm M là trung điểm của BC. Trên tia đối của tia MA lấy điểm D sao cho MA=MD. Chứng minh a) AD=DC b) AD //DC (ghi GT, KL nữa nha) làm nhanh giúp em với ạ
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