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trigonometry
Author:
jarypig1983
GeoGebra
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兩位數加法
柱體建築師
異分母分數減法
找出對稱軸
三位數除以一位數（二）
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圓 點 直線
PA + PB
反射(鉛垂線、水平線及斜線) Reflection (vertical line, horizontal line and line)
初中数学
直线与圆、圆与圆的位置关系
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Piecewise Functions
Centroid or Barycenter
Ellipse
Mode
Tangent Line or Tangent