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中考2019北京—24
Author:
宋晓燕
GeoGebra
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第八周作业
兩位數加法
柱體建築師
兩組對邊相等的四邊形
畫出對稱圖形
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分數乘法 (2012年9月27日更新)
How to reconstruct a quadrilateral farm to a triangular one with the same area?
纏繞畫
圓冪：到兩點的內積
七巧板（tangram）的副本
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Area
Surface
Linear Programming or Linear Optimization
Unit Circle
Algebra