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椭圆的定义
Author:
guomenglin
Topic:
Ellipse
GeoGebra
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球體建築師
球体的体积推导（优化版）
【案例】2013年安徽高考15题
拼砌四邊形
異分母分數減法
Discover Resources
gltzk 角錐的兩種展開圖
奠基
畢氏定理的副本
加法001(结果10以内)
f(x)=cosx的圖形--伸縮與平移
Discover Topics
Unit Circle
Differential Equation
Quadrilaterals
Intersection
Linear Regression