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tdoquynhchi
2 năm trước
Cho đường tròn (O) đường kính AB. Trên đoạn thẳng OB lấy điểm H bất kì ( không trùng O,B). Trên đường thẳng vuông góc với OB tại H. Lấy 1 điểm M ở ngoài đường tròn; MA và MB thứ tự cắt đường tròn (O) tại C và D. Gọi I là giao điểm của AD và Bc. Cm tứ giác MCHB là tứ giác nội tiếp.
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