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橢圓的切線作圖
Author:
紀延平
GeoGebra
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兩組對邊相等的四邊形
判斷球體
三位數除以一位數（一）
四邊形的特性
錐體建築師
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winter vacation homework 9
手表内部秒针结构示意
分數認識
How to draw a pentagon with ruler and compasses?
滑桿
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Area
Fractal Geometry
Expected Value
Cylinder
Linear Functions