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动圆在定圆上滚动
Author:
yhf
GeoGebra
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【案例】2013年安徽高考15题
GeoGebra笔记功能体验课件
三位數除以一位數（一）
異分母分數減法
第八周作业
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正三角形的旋轉
Circle
探究
老師講解6
正三角形在长方形边上移动加滚动
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Set Theory
Polynomial Functions
Arithmetic
Ratios
Surface