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dongphi69
2 năm trước
Cho Δ ABC vuông tại A (AB<AC). Trên BC lấy D sao cho BD=BA. Đường vuông góc với BC tại D cắt AC ở E. Đường phân giác góc ngoài tại đỉnh C của ΔABC cắt BE ở K. Tính góc BAK
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