Cho mình hỏi câu d  :
Cho tam giác ABC vuông tại A, đường cao AH. Kẻ phân giác của góc ABC cắt AH tại D và cắt AC tại E.
a)cm: tam giác HBA đồng dạng với tam giác ABC và AB.AB=BH.BC
b) cm: AB.HD=AE.HB
c) Kẻ AI vuông góc với  BE tại I và cắt BC tại K. cm: BK.BK=BI.BE
d) Cho S tam giác HCE=3S tam giác BHI. cm: BC=2BI

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