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平行四邊形有甚麼特性？
Author:
Anthony OR 柯志明
Topic:
Parallelogram
English version:
http://ggbtu.be/m79826
GeoGebra
New Resources
兩位數除以一位數（二）
拼砌四邊形
畫出對稱圖形
找出對稱軸
柱體建築師
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亂數取值 by java
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