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二元二次方程(二次曲线)
Author:
ericlee
GeoGebra
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撒针估算面积实验
龙形曲线-分形龙
龙形曲线-分形龙2
常见四边形是否是双心四边形
折扣
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简易立体几何
hint
畢氏定理
半圓上的圓周角
玖数小学数学
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Percentages
Linear Equations
Probability
Limits
Vectors