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任意凸多边形的滚动
Author:
赵林
GeoGebra
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直線的斜率
漂亮的摇摆曲线
球体的体积推导
讀磅
【案例】2013年安徽高考15题
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第一冊
三角形的內角和+內心與外心
Copy of 包含除法（1 ÷分數）
k-ko-
椭圆的定义
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Trigonometry
Plane Figures or Shapes
Sphere
Division
Parallelogram