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Mr CHANG
GeoGebra
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中华人民共和国国旗
椭圆内切圆链
常见四边形是否是双心四边形
第三周作业效果演示
第八周作业1
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三角形的工具
七巧板
(3D) Tasks: Pyramid, Paper folding & Solid of revolution[20170615]
學習活動二解的圖形
外心
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Numbers
Arithmetic Operations
Parallelogram
Mathematics
Integral Calculus