Bài 2: Cho tam giác ABC vuông tại A, đường cao AH. Trên tia đối của tia CA lấyđiểm D. Từ A kẻ AE LBD tại E.a, CMR: tam giác ABC đồng dạng với tam giác HBA.b) Tính AH biết AB=4cm;AC=3cm. c) CMR: BHE = BDC d) Gọi giao điểm BC và AE là I. AH cắt BD tại F, FI cắt AB tại K.CMR: (AB + AF + BF) ^ 2 >= 4(A * E ^ 2 + B * H ^ 2 + F * K ^ 2)

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