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Author:
longrivercn
GeoGebra
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撒针估算面积实验
正方形雪花图案
龙形曲线-分形龙2
折扣
百分數及其應用
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數線的繪製
算幾不等式
愛心
线段-视觉差
翰林數學_2下_CH3-1_多邊形的外角和
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Symmetry
Trigonometry
Division
Cylinder
Power Functions