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反比例
Author:
军云
GeoGebra
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四邊形的特性
判斷球體
兩組對邊相等的四邊形
球体的体积推导（优化版）
錐體建築師
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宬風老師的GGB教師研習教材
angle between lines
四邊形四個西姆松圓交於九點心
數學傳播39卷4期, 平面幾何公式思考
初中数学教材配套资源【人教】
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Real Numbers
Centroid or Barycenter
Exponential Functions
Trigonometry
Trapezoid