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光的折射（光线自右下向左上）
Author:
樊双平
GeoGebra
New Resources
GeoGebra笔记功能体验课件
四邉形 (四年級) 教師版
【案例】圆柱体内放置一个大球六个小球
球體建築師
三位數除以一位數（一）
Discover Resources
方格紙上畫正方形4
軌跡
我的第一個GGB影片
Drag the red dots, see the area ratio of EHFG to ABCD
一半模型归纳
Discover Topics
Inequalities
Linear Programming or Linear Optimization
Isosceles Triangles
Correlation
Cylinder