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方格纸上画平行线和垂线
Author:
郭勇
GeoGebra
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第三周作业效果演示
常见四边形是否是双心四边形
第八周作业2
科赫雪花
撒针估算面积实验
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平行線截等比例
折扣 例6
Trapezoid1
gpxxz 線性組合：六角星、mj100-3
七巧板（tangram）的副本
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Random Variables
Similar Triangles
Ratios
Expected Value
Surface