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Author:
辛贺华
GeoGebra
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平行線的判定
常见四边形是否是双心四边形
第八周作业3
中华人民共和国国旗
异形操场
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拋物線之極偶 / polarity for parabola
圓柱截痕
三角恒等式證明
多重指令
圓面積的應用
Discover Topics
Cosine
Statistical Characteristics
Square
Exponential Functions
Binomial Distribution