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hoavinhdc
2 năm trước
Cho tam giác ABC có AB<AC. Trên cạnh AC lấy điểm D sao cho AB=AD. Kẻ tia Ax là tia phân giác góc BAC, tia này cắt AD tại H. a) Chứng minh rằng H là trung điểm của cạnh BD. b) I trên tia AB lấy điểm E sao cho AE=AC. Gọi I là trung điểm của Ax và BC. Chứng minh rằng ba điểm D,E,F cùng nằm trong đoạn thẳng
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