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正方形與正三角形
Author:
李春培
正方形與正三角形
GeoGebra
New Resources
三位數除以一位數（二）
畫出對稱圖形
柱體建築師
四邉形 (四年級) 教師版
兩位數加法
Discover Resources
賺賠：例1
跳舞的六角形
尺規作圖平分一個角
光的折射
生日问题
Discover Topics
Translation
Isosceles Triangles
Pythagoras or Pythagorean Theorem
Poisson Distribution
LCM and GCD