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flag 北韓國旗 North Korea
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学用数学
GeoGebra
New Resources
异形操场
龙形曲线-分形龙
第三周作业效果演示
活动三:应用性质
第八周作业2
Discover Resources
類尺規作圖
Conway's Circle
孔明棋
內心
躲掉1,-1,0的動態文字
Discover Topics
Optimization Problems
Reflection
Cylinder
Arithmetic
Derivative