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Author:
袁智强
GeoGebra
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漂亮的摇摆曲线
球体的体积推导（优化版）
球体的体积推导
探究三角形的全等條件
兩位數加法
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弦的定理
題 5
四邊形四個九點圓共點(九點心)
以剪貼比較圖形大小 題1
正弦函數的遞增與遞減
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LCM and GCD
Mathematics
Hypothesis Testing
Ellipse
Step Functions