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luuhaibinh
2 năm trước
cho o có dây ab cố định và m là điểm di động trên cung lớn ab từ m vẽ mh vuông góc với ab gọi e và f lần lượt là hình chiếu của h trên ma mb qua m vẽ đường thẳng vuông góc với è cắt ab tại d chứng minh đường thẳng md đi qua một điểm cố định chứng minh ma^2/mb^2=ah/bd.ad/bh
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