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錯角---垂直平行綫
Author:
chanfushun
GeoGebra
New Resources
兩位數除以一位數（二）
柱體建築師
算柱 (兩位數)
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
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正四面體的反射對稱
認識對稱圖形
ch14 p.30#31
consistent equation 3x3
平移中心
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Median Line
Complex Numbers
Unit Circle
Variance
Pie Chart or Circle Chart