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俄罗斯方块
Author:
孟宝兴
GeoGebra
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四邉形 (四年級) 教師版
兩組對邊相等的四邊形
兩位數除以一位數（二）
找出對稱軸
四邊形的特性
Discover Resources
彈道
lab5_task2
公因數應用題
fsfafasfas
七角柱(可側轉、上下轉)
Discover Topics
Complex Numbers
Upper and Lower Sum or Riemann Sum
Perimeter
Prism
Line Segment