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Cho đường tròn (O) và một điểm K nằm cố định ngoài đường tròn. Đường thẳng KO cắt đường tròn tại A và B (A nằm giữa K và B). Gọi M là 1 điểm bất kì trên đường tròn. CMR $KA \leq KM \leq KB$
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