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quangphat2k
2 năm trước
cho tam giác ABC cân ở A . trên cạnh AB lấy điểm M , trên tia đối của tia CA lấy điểm N sao cho AM+AN=2AB. chứng minh : a, BM=CN b, BC cắt MN tại trung điểm I của Mn
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