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winter vacation homework 9
Author:
sungsun0808
GeoGebra
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画直线等分三角形的面积
找出對稱軸
三位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
四邊形的特性
Discover Resources
簡單動畫
立方體截痕
Quiz on True Bearings 真方位角：測驗
buji
四下_認識小數(教師版)
Discover Topics
Natural Numbers
Variance
Equations
Multiplication
Coordinates