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蝴蝶定理
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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三位數除以一位數（二）
四邉形 (四年級) 教師版
兩位數加法
柱體建築師
球体的体积推导
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讀磅
初心者的進化
ie 4
z=sin(sqrt(x^2+y^2))
Illusion-若隐若现的白点
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Diagrams
Rotation
Linear Programming or Linear Optimization
Fractions
Random Variables