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向量的隐圆3-外接圆(1)

Author:吕胜

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近似值：有效數字
四邊形的特性
找出對稱軸
直角坐標平面上的旋轉變換
Nested spiral octagon

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碎形
IMO2014C
三角形內心
不等式組
橢圓1--同心圓法

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