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折射率的定義
Author:
Jia-ming Shiu
可以移動G、E、F 看出折射率的算法
GeoGebra
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找出對稱軸
判斷球體
四邉形 (四年級) 教師版
三位數除以一位數（二）
【案例】2018年全国1卷理科12题
Discover Resources
正n邊形的組合
vector stack pile
正三角形
畫圓
matrix of rotation transformation
Discover Topics
Trigonometric Functions
Median Value
Equilateral Triangles
Plane Figures or Shapes
Constructions