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S0G22 三角形三內角和180度
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学用数学
GeoGebra
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撒针估算面积实验
龙形曲线-分形龙
异形操场
折扣
第三周作业效果演示
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test1
垂線作圖
二次涵数的图象y=ax^2+b的副本
笛卡兒之心
橢圓3-平行四邊形法
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Trigonometry
Plane Figures or Shapes
Histogram
Cone
Equilateral Triangles