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孟氏定理 (Menelaus' theorem)
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
判斷球體
畫出對稱圖形
兩位數除以一位數（二）
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
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對稱
Weighted Mean 加權平均數
ruler
Christmas Tree
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Random Variables
Median Line
Expected Value
Fractions
Arithmetic