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反射定律 Law of Reflection
Author:
W.L. Wong, Albert
GeoGebra
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算柱 (兩位數)
画直线等分三角形的面积
【案例】2013年安徽高考15题
畫出對稱圖形
三位數除以一位數（一）
Discover Resources
斜率 - 概念及定義 (2)
Copy of 圖一
Copie de Comparing fractions using number lines and rectangles
Copy of 釘點紙畫三角形
五星红旗
Discover Topics
Integers
Hypergeometric Distribution
Tangent Function
Hypothesis Testing
Means