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linhhuonghung
2 năm trước
Bài 4: Cho (O,R), CD là dây có trung điểm E. Trên tia đối của tia CD lấy M. Kẻ tiếp tuyến MA, MB với đường tròn (A, B là các tiếp điểm ). Đường thẳng MO cắt AB tại H, cắt đường tròn tại I (I nằm giữa M và O) Chứng minh năm điểm M, A, O, E, B cùng thuộc một đường tròn. Chứng minh OH.OM = R2 . Chứng minh CI là phân giác của góc MCH Đường thẳng AB cắt OE tại K. Khi M di chuyển trên tia đối của tia CD thì AB luôn đi qua một điểm cố định. Giup mik câu c d với mn K làm được Cảm ơn vì đã xem và giúp
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