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illusiion 6 平行线错觉
Author:
arist
GeoGebra
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撒针估算面积实验
科氏力 (Coriolis Force)
正方形雪花图案
平行線的判定
常见四边形是否是双心四边形
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全等三角形
認識函數值
ie 7
一元二次方程式公式解步驟
橢圓軌跡_過圓內一點與圓內切
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Optimization Problems
Plane Figures or Shapes
Constructions
Functions
Trigonometry