cho tam giác ABC vuông tại A. Phân giác BF .từ I nằm giữa B và F.Vẽ đường thẳng song song AC cắt AB Ac lần lượt tại M và N .vẽ đường tròn ngoài tiếp tam giác BIN cắt đường thẳng AI tại D.các đường thẳngDN và BF cắt nhau tại E. a)cứng minh 4 điểm A B D E cùng thuộc một đường tròn b)chứng minh 5 điểm A, B,C,D,E cùng thuộc một đường tròn và BE vuông góc CE/

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