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Thanhquang97
2 năm trước
Bài IV. (3,5 điểm) Cho tam giác nhọn ABC đường cao AH , phân giác trong góc BAC cắt BC tại O , qua O dựng các đường thẳng OM vuông góc với AB , ON vuông góc với AC . 1) Chứng minh: 5 điểm A M H O N , , , , cùng nằm trên một đường tròn. 2) Chứng minh: AH là phân giác của MHN . 3) Đường thẳng qua O vuông góc với BC cắt MN tại K . Chứng minh: KN AC KM AB . . .  4) Gọi I là trung điểm BC. Chứng minh: A K I , , thẳng hàng.
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