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Author:
林俊志
GeoGebra
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球体的体积推导（优化版）
三位數除以一位數（一）
錐體建築師
兩組對邊相等和有直角的四邊形
第八周作业
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Elementary school math
Concept of Ratios 比的概念
任意兩正方形切割重組成一大正方形之動態證明
maze-temp
test04
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Conic Sections
Intersection
Trigonometry
Tree Diagrams
Translation