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兩圓內外公切線
Author:
梅
GeoGebra
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球體建築師
兩組對邊相等的四邊形
判斷球體
錐體建築師
兩位數加法
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題八
量度身高
Q123
箭头平移动画
勾股定理III 基於歐基里德(Euclid)的證明
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Limits
Integral Calculus
Quadrilaterals
Optimization Problems
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