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duaconcuachua
2 năm trước
Cần câu c Cho Δ ABC vuông tại A. Đường phân giác BD (D ∈ AC). Kẻ DH vuông góc với BC (H ∈ BC). Gọi K là giao điểm của BA và HD. Chứng minh: a) AD = HD b) BD ⊥ KC c) 2( AD+AK ) > KC.
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