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动圆与两圆外切与内切(2)
Author:
蔡永志
动圆与两圆外切与内切(2)
GeoGebra
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球体的截面
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常见四边形是否是双心四边形
比較五件物件的重量
平行線的判定
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binary number system
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illusion 鏡射
分數乘法1
數學傳播39卷4期, 平面幾何公式思考
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Real Numbers
Median Value
Centroid or Barycenter
Geometry
Multiplication