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Cho tam giác ABC cân tại A góc ACB=30 độ .Tia phân giác của góc ABC cắt cạnh AC tại M .Lấy điểm K trên cạnh BC sao cho BK=BA.a) Chứng minh tam giác ABM=tam giác KBM.b) Gọi E là giao điểm của các đường thẳng AB và KM.Chứng minh tam giác MEC cân.c) Chứng minh tam giác BEC đều .d) Kẻ AH vuông góc với EM ( H thuộc EM).Các đường thẳng AH và EC cắt nhau tại N .Chứng minh KN vuông góc với AC
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