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untitled a01
Author:
黃斌
GeoGebra
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異分母分數減法
四邉形 (四年級) 教師版
球體建築師
兩組對邊相等的四邊形
兩位數除以一位數（二）
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vbcvbcvbcvbcvbcvcv
Apollonius Problem 10 CCC poncelet
圓滾動
sin(x) 的函數圖形的副本
a>1, y=Log(a,x) and y=a^x 有可能0,1,2交點!? 的複本
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Logic
Polygons
Sphere
Differential Equation
General Quadrilateral