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6-6-4-热量自发从低温物体传向高温物体（第二类永动机）3-尤景汉
Author:
王翚
GeoGebra
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四邊形的特性
畫出對稱圖形
第八周作业
找出對稱軸
球體建築師
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a sin(bx+c) + d 的圖形
消失的面積(二)
八角柱(可側轉、上下轉)
分數加法
duality of regular polyhedron
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Incircle or Inscribed Circle
Random Experiments
Equations
Ratios
Conditional Probability