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duythanh
2 năm trước
Cho nửa đường tròn o đường kính bc, điểm a thuộc cung nửa đường tròn, điểm e đối xứng với b qua a. a. Tam giác BCE là tam giác gì? B.gọi D là giao điểm của CE với nửa đường tròn. Kẻ tiếp tuyến Bx với nửa đường tròn. Chứng minh BA là tia phân giác của góc DBx C.CA cắt BD, Bx lần lượt theo thứ tự ở L,K. Tứ giác BKEL là hình gì?
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