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winter vacation homework 12
Author:
sungsun0808
GeoGebra
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異分母分數減法
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
三位數除以一位數（二）
算柱 (兩位數)
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直方圖_Demo
轨迹2016.4.16
Copy of 固定周界的長方形的面積變化
分數約分
任務4的副本
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Numbers
LCM and GCD
Volume
Matrices
Circumcircle or Circumscribed Circle