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双镜面反射问题
Author:
孟宝兴
Topic:
Symmetry
GeoGebra
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【案例】2013年安徽高考15题
畫出對稱圖形
兩組對邊相等的四邊形
三位數除以一位數（一）
兩位數除以一位數（一）
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蝴蝶定理推廣證明1
周界和面積
How to draw an octagon with ruler and compasses?
Copy of 表示數線上的位置
正立方體切三刀
Discover Topics
Statistics
Rational Numbers
Rectangle
Scalene Triangles
Vectors