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2 năm trước
Cho tam giác DEF cân tại D. Trên cạnh EF lấy 2 điểm A, B sao cho EA = BF (điểm A nằm giữa B và E). a. Chứng minh tam giác AED = BFD b. Kẻ AH vuông góc ED, BK vuông góc DF (H thuộc DE, K thuộc DF). Chứng minh AH = BK c. Chứng minh HK // EF
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