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特製的門 2
Author:
李春培
特製的門2
https://www.facebook.com/video.php?v=730160733696759&fref=nf
GeoGebra
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球体的体积推导（优化版）
球体的体积推导
第八周作业
球體建築師
四邉形 (四年級) 教師版
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直線與曲線
特別角的三角函數值(1)
If x^2 + x + k > 0 for any real value of x, what is k?
繪圖
折線軌跡
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Linear Functions
Trigonometry
Upper and Lower Sum or Riemann Sum
Linear Equations
Symmetry