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四邊形四個西姆松圓交於九點心
Author:
連琨銘
GeoGebra
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兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
判斷球體
直角坐標平面上的旋轉變換
三位數除以一位數（二）
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指數函數與二次函數101.11.26
Trigonometry
glt-h02-05-圓錐展開
二元线性规划的图解法(18.2 例6)
我的第一个GGB绘本
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Quadratic Equations
Linear Regression
Sequences and Series
Standard Deviation
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