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phat682003
2 năm trước
Bài đã có trong hình. (Lời: Cho ΔABC vuông tại A. Kẻ tia phân giác BD (D ∈ AC). Kẻ D vuông góc với BC tại H (H ∈ BC) . Kẻ tia BA và HD, gọi giao điểm của hai tia ấy là K. C/m ΔKDC là tam giác cân)
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