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mooc第四讲椭圆反射
Author:
单晨
GeoGebra
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第八周作业
三位數除以一位數（二）
三位數除以一位數（一）
兩位數除以一位數（一）
四邊形的特性
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Quiz on Indices and Logarithms 指數和對數：測驗
轉盤1
畢氏定理拼圖007(8片)
工具：PlaneString
Copy of 釘點紙畫三角形
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Equilateral Triangles
Kite
Cylinder
Addition
Linear Regression