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圓錐截面曲線
Author:
Tone
GeoGebra
New Resources
拼砌四邊形
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
畫出對稱圖形
【案例】圆柱体内放置一个大球六个小球
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橢圓軌跡
ghseh 二次函數描點法
弗雷澤螺旋幻覺圖(難度99%)
旋转多边形
F4_Ch9.1 任意角的三角比
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Histogram
Special Points
Right Triangles
Complex Numbers
Addition