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缠绕画万花筒
Author:
浅蓝色
GeoGebra
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第八周作业2
中华人民共和国国旗
科赫雪花
比較五件物件的重量
双心四边形
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整數÷整數_工作紙（一）_題3
Clock
Text in Spreedsheet
椭圆滚动
Addition and Subtraction of Directed Numbers (1)
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Geometry
Linear Programming or Linear Optimization
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Mathematics