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http://www.qsir.org/?p=8853
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http://www.qsir.org/?p=8853
GeoGebra
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三位數除以一位數（二）
判斷球體
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
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緯度、日照、影長
畢氏定理
直角梯形
Angle between a Line and a Plane
連鎖法則 (Chain Rule)
Discover Topics
Incircle or Inscribed Circle
Quadrilaterals
Circumcircle or Circumscribed Circle
Sphere
Linear Programming or Linear Optimization