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椭圆的定义
Author:
GeoGebra Institute of WuXi
GeoGebra
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兩位數除以一位數（二）
找出對稱軸
【案例】2013年安徽高考15题
拼砌四邊形
異分母分數減法
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分數除法3: a ÷ b （包含）
GGB基礎教學Reuleaux
圓內接四邊形任務二：提示一
MY first GGBBook
常见几个曲面
Discover Topics
Polygons
Inequalities
Histogram
Curve Sketching
Quadratic Functions