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三角形的四心
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GeoGebra
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平行線的判定
异形操场
球体的截面
正方形雪花图案
第三周作业效果演示
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Reflectional Symmetry 反射對稱
有向數
winter vacation homework 6
对角线互相垂直的四边形,证倍分关系的副本
紙張的長與闊
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Probability
Solids or 3D Shapes
Logarithmic Functions
Addition
Integral Calculus