Bài 15: Cho 3 điểm A, B, C theo thứ tự trên đường thẳng xy. Lấy điểm M sao cho A là trung điểm của BM. Lấy điểm N sao cho C là trung điểm của BN. Chứng minh MN = 2.AC. Giúp mk part 2 mn ơi :'D

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