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太极图
Author:
吕胜
GeoGebra
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兩位數除以一位數（一）
兩組對邊相等的四邊形
柱體建築師
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
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動態文字2次函數
指數函數與二次函數的交點數
畢氏定理完成20170330
四邊形的邊長與限制
拼圖2
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Special Points
Rhombus
Set Theory
Arithmetic Operations
Parametric Curves