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P43 图2-2(1)
Author:
常振虎
GeoGebra
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球體建築師
找出對稱軸
兩位數除以一位數（二）
拼砌四邊形
兩組對邊相等的四邊形
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圓內弦中點軌跡
簡單動畫
repetitive squares by excel
圆锥曲线的第二定义的副本
兩位數除兩位數(例子二)
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Area
Sphere
Curve Sketching
Translation
Logarithm