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橢圓包絡線
Author:
rachmaninoff
GeoGebra
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拼砌四邊形
【案例】2018年全国1卷理科12题
三位數除以一位數（二）
柱體建築師
異分母分數減法
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常數函數平移(進階)
廣義角的代換(90,270)
圓與三角形中點的軌跡
分數乘法
网易
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Parametric Curves
Rational Numbers
Derivative
Perimeter
Equilateral Triangles