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Cho ∆ABC cân tại A, đường cao AD, K là trung điểm của AD. Gọi I là hình chiếu của điểm D trên CK. Gọi H là giao điểm của AD và BI; E là giao điểm của AI và BC. CMR: câu a) IK/ID = KA/BD ; câu b) EH vuông góc với AB
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