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illusiion 6 平行线错觉
Author:
arist
GeoGebra
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龙形曲线-分形龙2
撒针估算面积实验
平行線的判定
龙形曲线-分形龙
常见四边形是否是双心四边形
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三角形3,4,5
平面外積、有向面積、二階行列式
Graphs of exponential functions
玖数小学数学
模拟时钟
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Reflection
Pyramid
Histogram
Matrices
Arithmetic