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Author:
zhusujuan
GeoGebra
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常见四边形是否是双心四边形
直線的斜率
垂直線的斜率
斜率的值
双心四边形
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平移指令
勒洛三角形(方型鑽子模型)
各種四邊形
除法2
畢氏定理 的複本
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Surface
Planes
Distributions
Coordinates
Linear Programming or Linear Optimization