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椭圆的性质1
Author:
邹丽华
GeoGebra
New Resources
兩位數除以一位數（二）
兩位數加法
三位數除以一位數（一）
球體建築師
判斷球體
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TESTAERE
反演的應用：鞋匠的小刀
ghseh 二次函數的開口大小
正七角錐(旋轉，實體、透視)
小數的認識（一）
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Real Numbers
Volume
Quadratic Equations
Similar Triangles
Symmetry