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特製的門
Author:
李春培
特製的門
https://www.facebook.com/video.php?v=730160733696759&fref=nf
GeoGebra
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GeoGebra笔记功能体验课件
算柱 (兩位數)
三位數除以一位數（二）
四邉形 (四年級) 教師版
畫出對稱圖形
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test
多重指令
Orthocentre
含参的分段函数的单调性问题
公切線長度的計算的副本
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Linear Equations
Line Segment
Logic
Sine
Linear Programming or Linear Optimization