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徐熙伟
GeoGebra
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兩組對邊相等的四邊形
判斷球體
錐體建築師
球體建築師
四邊形的特性
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圓內接四邊形 ABCD ...,求 sinθ=?
畢氏定理
二次曲線的準線與焦點
gjh-e01-03 未知數邊長的三角形
平面截正立方体
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Percentages
Translation
Piecewise Functions
Function Graph
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