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hoangvinh2k
2 năm trước
Tam giác ABC vuông tại a đường phân giác BD kẻ AE vuông góc với BD AE cắt BC ở K A)Chứng minh tam giác ABK cân tại b B) chứng minh DK vuông góc BC C)kẻ AH vuông góc BC . Chứng minh AK là tia phân giác của góc HAC D)gọi I là đạo điểm của AH và BD. Chứng minh IK//AC
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