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1989全国文2
Author:
常振虎
GeoGebra
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四邊形的特性
四邉形 (四年級) 教師版
柱體建築師
兩組對邊相等的四邊形
找出對稱軸
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近似值：小數位及有效數字
Klein Bottle
thm 11,12
切割正八面體
鸚鵡螺旋線
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Continuity
Special Points
Derivative
Logic
Sphere