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 )
- Target Group (Age)
- 15 – 18
- Language
- Chinese Traditional / 繁體中文
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