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勾股定理证明
Author:
万超杰
GeoGebra
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異分母分數減法
算柱 (兩位數)
三位數除以一位數（二）
【案例】2018年全国1卷理科12题
【案例】圆柱体内放置一个大球六个小球
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利用積分計算次方總和
quadrilaterals 4
九點圓
廣義三角：tan
圓周的計算
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Derivative
Circumcircle or Circumscribed Circle
Combinatorics
Normal Distribution
Mode