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生日问题1
Author:
徐晓东
GeoGebra
New Resources
比較五件物件的重量
第八周作业1
第八周作业3
异形操场
三角函数 的副本
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http://www.qsir.org/?p=8853
圆的面积 - 排列组合法
Transformation of Functions
分數乘法
Ex5D#2
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Orthocenter
Diagrams
Tangent Function
Quadrilaterals
Statistics