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教学素材：椭圆离心率
Author:
清风拂琴，陌上花开
GeoGebra
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球体的体积推导
兩位數除以一位數（一）
三位數除以一位數（一）
找出對稱軸
判斷球體
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函数图像研究
gslsb 正方形數列
Copy of 固定面積的圖形的周界變化
动圆在定圆上滚动
三角形的外心
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Equations
Area
Cube
Pyramid
Trigonometric Functions