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特製的門
Author:
李春培
特製的門
https://www.facebook.com/video.php?v=730160733696759&fref=nf
GeoGebra
New Resources
柱體建築師
兩位數除以一位數（二）
拼砌四邊形
錐體建築師
球体的体积推导（优化版）
Discover Resources
畢氏定理
LinearProgramming
testing book
求兩斜線區域的差
橢圓3--平行四邊形法
Discover Topics
Upper and Lower Sum or Riemann Sum
Constructions
Isosceles Triangles
Diagrams
Planes