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Cho tam giác AOB cân kẻ tia phân giác của góc AOB cắt AB tại H 1) Chứng minh HA=HB 2) trên cạnh OA lấy điểm M và trên cạnh OB lấy điểm N sao cho OM=ON. chứng minh HM =HN 3) Chứng minh MN song song AB.
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