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lehoangsonlqm
2 năm trước
Cho hình vuông ABCD. Gọi M là trung điểm BC, N là điểm thuộc đường chéo AC sao cho AN=1/4AC. Chứng minh 4 điểm M,N,C,D nằm trên cùng một đường tròn.
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