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nghiaphan1009
2 năm trước
Cho tam giác ABC vuông tại A, . Tia phân giác của góc ABC cắt cạnh AC tại M. Lấy điểm K trên cạnh BC sao cho BK = BA. a) Chứng minh: và b) Gọi E là giao điểm của AB và KM. Chứng minh: tam giác MEC cân. c) Chứng minh: tam giác BEC đều. d) Chứng minh: K là trung điểm của BC. e) Kẻ . Đường thẳng AH và EC cắt nhau tại N. Chứng minh: KN vuông góc với AC
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