Cho góc nhọn xOy. Trên Ox lấy điểm A , trên Oy lấy điểm B sao cho OA = OB. Từ A kẻ đường thẳng vuông góc với Ox cắt Oy ở E, từ B kẻ đường thẳng vuông góc với Oy cắt Ox ở F. AE và BF cắt nhau tại I Chứng minh a) AE = BF b) tam giác AFI = tam giác BEI c) OI là tia phân giác của góc AOB ( Ai tl nhanh nhất e vote 5 sao ạ )

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