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海岛算经
Author:
Dai xuan
GeoGebra
New Resources
撒针估算面积实验
盈利與虧蝕
异形操场
龙形曲线-分形龙2
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畫圓周範例檔
四下_面積（一）(教師版)
Copy of fluid mechanics
指数函数的副本
Discover Topics
Parabola
Solids or 3D Shapes
Cone
Fractions
Definite Integral