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myao1999
GeoGebra
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兩位數除以一位數（一）
兩位數加法
GeoGebra笔记功能体验课件
兩組對邊相等的四邊形
【案例】2013年安徽高考15题
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圓外一點到圓的距離
mathmedia_40204
ghk106a07 圓半徑與外切、外離關係
pythLK
广义三角函数的化简(诱导公式)的副本
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Natural Numbers
Fractions
Standard Deviation
Planes
Trigonometric Functions