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相机光圈模拟（3D）
Author:
孟宝兴
Topic:
Mode
GeoGebra
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撒针估算面积实验
圓的切線方程
第八周作业2
圓的基本性質
科赫雪花
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this is math pic
題二
y=a(x-h)²+k的副本
Copy of 折扣 例5
任意凸多边形的滚动
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Fractions
Inequalities
Median Line
Polygons
Parallelogram