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Cho tam giác ABC cân tại A, tia phân giác góc A cắt BC tại D. a. Chứng minh DB = DC. b. Kẻ DH vuông góc AB (H thuộc AB), DK vuông góc AC (K thuộc AC). Chứng minh Tam giác DHK cân. c. Chứng minh HK // BC ( nhớ vẽ hình)
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