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Author:
Sheu Anderson
GeoGebra
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異分母分數減法
空间中两直线的位置关系
平行線的斜率
直線的斜率
兩位數除以一位數（二）
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testing
Homework3
How to draw a hexagon with ruler and compasses?
外心的位置
圓周 (圖形D) 的複本
Discover Topics
General Quadrilateral
Statistical Characteristics
Cosine
Geometry
Rhombus