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未完成的版本
Author:
dunst kang
GeoGebra
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兩位數加法
近似值：有效數字
【案例】2018年全国1卷理科12题
三位數除以一位數（二）
異分母分數減法
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線段上分點軌跡(橢圓)
資料點 x1, x2, ..., xn
Angles between 2 planes
圖形的周界 3
任意三棱锥的外接球
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Real Numbers
Rectangle
Equilateral Triangles
Piecewise Functions
Fractal Geometry