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Truong2k
2 năm trước
Cho ∆ABC có AB < AC , trên tia AB lấy điểm D sao cho AD = AC . Tia phân giác của góc A cắt cạnh BC tại E, cắt AC tại K a/ Chứng minh : ∆AED = ∆AEC b/ Chứng minh : AK = AB c/ Kẻ BH vuông góc với DC tại H. Chứng minh rằng : BH song song AE
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