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能量守恆
Author:
李春培
能量守恆
GeoGebra
New Resources
拼砌四邊形
兩位數加法
兩組對邊相等的四邊形
錐體建築師
兩位數除以一位數（二）
Discover Resources
Pythagorean Triples 畢氏數組
翰林B4講p192-例1
二年級_柱體的觀察
数学涂鸦
頂、棱與面
Discover Topics
Quadrilaterals
Arithmetic Operations
Rectangle
Centroid or Barycenter
Pie Chart or Circle Chart