cho tam giác nhọn ABC .về phía ngoài tam giác vẽ các tam giác vuông cân ABE và ACF có A là đỉnh góc vuông . Gọi I là trung điểm của cạnh BC . trên tia đối của IA lấy điểm D sao cho ID = IA . Nối B với D . chứng minh a, BF = CE b, tam giác ABD = tam giác EAF c, AI vuông góc vs EF làm ít nhất 2 câu nha, hứa sẽ vote đầy đủ các chuyên gia giúp em với ạ

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