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Manh2k1
2 năm trước
Cho tam giác ABC vuông ở A. Trên AC lấy một điểm M và vẽ đường tròn đường kính MC tâm O. Kẻ BM cắt đường tròn tại D. Đường thẳng DA cắt đường tròn tại F. Chứng minh rằng 1. ABCD nội tiếp 2. CA là tia phân giác góc FCB 3. gọi E là giao điểm của BC với (O) . chứng minh BA,EM,CD đồng quy 4. MD là tia p/g của góc ADE 5. M là tâm đường tròn nội tiếp tam giác ADE
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