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光的折射（光线自右下向左上）
Author:
樊双平
GeoGebra
New Resources
画直线等分三角形的面积
兩位數除以一位數（一）
異分母分數減法
找出對稱軸
四邉形 (四年級) 教師版
Discover Resources
圓錐的截面
Nets of a square pyramid
圓周率的應用 題1
错觉多边形
找出對稱軸
Discover Topics
Geometric Mean
Hypergeometric Distribution
Interest Calculation
Exponential Functions
Orthocenter