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Erdos-Mordell 不等式
Author:
羅驥韡 (Pegasus Roe)
Erdos-Mordell 不等式 三角形 ABC 內一點，到三頂點的距離分別為 x、y、z，到三邊的距離分別為 p、q、r，則： x + y + z ≥ 2( p + q + r )
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