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四下:三角形内角和(折叠法)
Author:
钟秀群
GeoGebra
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第八周作业2
第三周作业效果演示
比較五件物件的重量
百分數及其應用
异形操场
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人教A版3.1.3,空间向量的数量积分配律
算幾不等式
函数作图工具的副本
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Power Functions
Ellipse
Right Triangles
Pythagoras or Pythagorean Theorem
Parametric Curves