Ở phía ngoài tam giác ABC nhọn (AB<AC), vẽ tg ACD và tg ACE vuông cân tại A. Kẻ AH vuông BC cắt DE tại F. Chứng minh DE=EF
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27 tháng 3 2016
từ a kẻ đường thẳng song song với AM cắt AI tại O chứng minh tam giác OAN = ABC