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特殊線.ggb
Author:
cyrus
GeoGebra
New Resources
常见四边形是否是双心四边形
第八周作业
比較五件物件的重量
平行線的判定
直線的斜率：水平變化 & 鉛垂變化
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我的测试
蝴蝶定理推廣證明2(交比)
國旗 做很久的
任意四边形各边中点的连线必构成平行四边形.许兴华数学
旋轉圓弧
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Arithmetic Operations
Centroid or Barycenter
Differential Equation
Normal Distribution
Translation