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ynhu151
2 năm trước
Giúp mik với, vẽ hình nữa nha Bài : Cho tam giác AMN cân tại A, lấy điểm B trên cạnh AM, điểm C trên cạnh AN sao cho AB=AC. Chứng minh tứ giác BCNM là hình thang cân.
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