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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
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三位數除以一位數（二）
兩組對邊相等的四邊形
第八周作业
柱體建築師
GeoGebra笔记功能体验课件
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EnergyMath 2-3 棣美弗定理
conjugate
圓的展開partII
縫衣針
探究余弦定理
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Inequalities
Coordinates
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