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凹凸透镜对平行光线的作用
Author:
李大地(Field Lee)
GeoGebra
New Resources
兩位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
畫出對稱圖形
兩位數除以一位數（二）
三位數除以一位數（二）
Discover Resources
動態面積展示
四下_認識小數(教師版)
How to draw an octagon with ruler and compasses?
周界(移邊)
雙曲線與斜率
Discover Topics
Line Segment
Geometric Transformations
Conic Sections
Distributions
LCM and GCD