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Author:
Ho-Kai Chen
GeoGebra
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盈利與虧蝕
科赫雪花
常见四边形是否是双心四边形
第八周作业
第八周作业1
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地球20160328
填色
circle
紙張的長與闊
第八周作业
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Translation
Functions
Sphere
Calculus
Straight Lines