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勾股定理证明
Author:
万超杰
GeoGebra
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比較五件物件的重量
撒针估算面积实验
第八周作业3
三角函数 的副本
活动三：应用性质
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五下_分數除法(學生版)
翰林B4講p192-例1
Ex.3
區塊斜線教學
分割多边形
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Upper and Lower Sum or Riemann Sum
Addition
Optimization Problems
Vectors 3D (Three-Dimensional)
Volume