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1983全国文10
Author:
常振虎
GeoGebra
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球體建築師
兩位數加法
三位數除以一位數（二）
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
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http://www.qsir.org/?p=8853
P3 下學期 Ex. 5 24小時報時制
畢氏定理
足迹
廣義角
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Linear Programming or Linear Optimization
Centroid or Barycenter
Straight Lines
Trigonometry
Rhombus