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翰林數學_2下_CH3-1_點線角
Author:
翰林數學
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
找出對稱軸
兩位數加法
球体的体积推导（优化版）
畫出對稱圖形
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Untitled1
坐标变换
反射路徑(角落進洞)
qr code for symmetry
other
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Multiplication
Division
Kite
Variance
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