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trinhgiang31102002
2 năm trước
Cho ∆ABC cân tại A . Trên cạnh AB lấy điểm H, trên tia đối của tia CA lấy điểm K sao cho CK = BH. Nối HK cắt BC tại I. Kẻ HE // AK (E  BC). Chứng minh rằng : a) ∆HBE cân tại M b) IH = IK c) AB + AC = AH + AK
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