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quadrilaterals 5
Author:
iedc
GeoGebra
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兩組對邊相等的四邊形
【案例】2013年安徽高考15题
柱體建築師
找出對稱軸
球体的体积推导（优化版）
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y=x²+a的圖形
測試
動畫
How to draw a square with ruler and compasses?
[洋葱] 二次函数中的将军饮马-下-Q2
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Plane Figures or Shapes
Arithmetic Mean
Tangent Function
Arithmetic
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