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畢氏定理推廣---餘弦定理(1)
Author:
官長壽(longlife)
GeoGebra
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平行線的判定
直線的斜率：水平變化 & 鉛垂變化
折扣
常见四边形是否是双心四边形
圓的切線方程
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Prime Factors - step by step
樞紐實驗
gmj106a12 旋轉矩陣與面積
gjc097a29 重心
三视图
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Fractions
Triangles
Statistical Characteristics
Hypothesis Testing
Constructions