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光的折射（光线自右下向左上）
Author:
樊双平
GeoGebra
New Resources
找出對稱軸
兩位數除以一位數（二）
第八周作业
球体的体积推导（优化版）
判斷球體
Discover Resources
甚麼是球體
DSE Circle-ACT06 Relationship of Tangents and Radius of a Circle
立體圖形
不等式
比例中的定值問題
Discover Topics
Cylinder
Polynomial Functions
Cosine
Vectors 2D (Two-Dimensional)
Ratios