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德·拉·希尔(de la hier)定理
Author:
沈翔
GeoGebra
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兩組對邊相等和有直角的四邊形
畫出對稱圖形
四邉形 (四年級) 教師版
算柱 (兩位數)
【案例】2013年安徽高考15题
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正多面體
point uion coloring
Witch of Agnesi
讀磅
圓例2
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Mode
Linear Equations
Addition
Power Functions
Linear Functions