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Pythagorean Fractal Tree
Author:
魏向东
GeoGebra
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球体的体积推导（优化版）
GeoGebra笔记功能体验课件
球體建築師
兩組對邊相等的四邊形
算柱 (兩位數)
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quadrilaterals 4
畢式定理 (08)
probwei1
彈幕
三角形
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Inequalities
Planes
Secant Line or Secant
Intersection
Parallelogram