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hoangtienlongld
2 năm trước
Cho tam giác ABC có AB > AC, trên cạnh AB lấy điễm D sao cho AD = AC. Lấy E là trung diem của đoạn thắng CD. Kẻ BK vuông góc với CD (điểmm K nằm trên đoạn thẳng CD). Chứng minh rằng: BK || AE. Giúp mình với🙂
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