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六上练习：时钟轨迹问题
Author:
肖昆明
GeoGebra
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兩位數加法
【案例】2013年安徽高考15题
三位數除以一位數（二）
球体的体积推导
兩位數除以一位數（一）
Discover Resources
基測試題五邊形滾動
二次函数的条件最值
conjugate
Reflection
等分例子
Discover Topics
Hypergeometric Distribution
Linear Regression
Quadratic Functions
Multiplication
Geometric Mean