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毕达哥拉斯的勾股定理证明图
Author:
许春兰
GeoGebra
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讀磅
探究三角形的全等條件
球体的体积推导
球体的体积推导（优化版）
圓周公式的應用
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雙曲線尺規作圖01
shihfeng的第一本Geogebra繪本
Apollonius Problem 8 CLL homo 12
如何求切線長
圆锥曲线
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Isosceles Triangles
Optimization Problems
Triangles
Linear Equations
Linear Programming or Linear Optimization