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illusiion 6 平行线错觉
Author:
arist
GeoGebra
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常见四边形是否是双心四边形
三角函数 的副本
中华人民共和国国旗
撒针估算面积实验
第八周作业2
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整數或分數÷分數_ 工作紙（一）_題2a
一元一次方程式
Copy of Liu Hui's Method of Finding π
兩圓內外公切線
勾股定理
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LCM and GCD
Statistical Characteristics
Matrices
Histogram
Geometry