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連連看！橢圓在哪裡？
Author:
楊澤璿
GeoGebra
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【案例】2013年安徽高考15题
兩位數加法
錐體建築師
找出對稱軸
判斷球體
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橢圓軌跡
Form 6(中六級)
gjh-h02-01 歐幾里德的畢氏證明
角度、弧度互換
七巧板（tangram）的副本
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Distributions
Quadrilaterals
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Functions
Probability