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Dieungoc
2 năm trước
Cho tam giác ABC vuông tại A. Tia phân giác của góc B cắt AC tại H. Kẻ HK vuông góc với BC tại K. a/ Chứng minh tam giác KAB cân b/ Trên tia đối của tia KH lấy điểm I sao cho KI=KH. Chứng minh CK là tia phân giác của góc HCI. c/ Gọi E là giao điểm của 2 đường thẳng HK và AB. Chứng minh AK//CE, BH vuông góc với CE
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