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2 năm trước
Cho tam giác ABC cân tại A, có AB<AC. Trên AC lấy điểm M sao cho AB=AM. Gọi N là trung điểm của BM. Từ C kẻ đường thẳng vuông góc với đường thẳng AN, đường thẳng này cắt tia AN và tia AB lần lượt tại D và E. a)Chứng minh:Tam giác ABN=Tam giác AMN và AN là phân giác của góc BAC b)Chứng minh tam giác ACE cân
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