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二面角
Author:
qianqianhouhou
二面角的概念，拖动A、E点改变半平面
GeoGebra
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三位數除以一位數（二）
兩組對邊相等的四邊形
畫出對稱圖形
算柱 (兩位數)
兩位數加法
Discover Resources
相對與絕對角速度
水波干涉
DSE Circle-ACT02A Relationship Between Angles and Centre and Circumference
包含除法（1 ÷分數）的副本
描点法画三角函数图像
Discover Topics
Function Graph
Random Variables
Sequences and Series
Similarity Transformation or Similarity
Fractal Geometry