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cucnt
2 năm trước
1/ Cho ΔABC có góc ACB= 90' + góc ABC. Kẻ đường cao AH của ΔABC CM: AH²= BH.CH 2/ Cho ΔABC (AB<AC) đường phân giác AD. Đường trung trực AD cắt BC ở K. a/ CM: ΔKAB đồng dạng ΔKCA b/ Tính độ dài KD biết BD=2cm, DC=4cm
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