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mooc第四讲椭圆反射
Author:
单晨
GeoGebra
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三位數除以一位數（一）
三位數除以一位數（二）
兩組對邊相等的四邊形
【案例】2013年安徽高考15题
拼砌四邊形
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南女校徽外型
ghseh 二次函數描點法左右平移-6
題1
Area between two curves
分數的圖示的副本
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Vectors 2D (Two-Dimensional)
Area
Conditional Probability
Confidence Interval
Fractions