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利用对称求线段和最值（移动端）
Author:
梁航宇
GeoGebra
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GeoGebra笔记功能体验课件
sanjiaohanshu
球體建築師
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異分母分數減法
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三角形四心
比例
相似三角形的邊長成比例
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圓與切線
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Pyramid
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Centroid or Barycenter