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探究活动：画椭圆
Author:
李晶
GeoGebra
New Resources
画直线等分三角形的面积
兩組對邊相等的四邊形
球体的体积推导（优化版）
球體建築師
判斷球體
Discover Resources
最小平方法
四連桿(可調)
Properties of a Rectangle
Net of prism
线段
Discover Topics
Inequalities
Vectors
Probability
Difference and Slope
Stochastic Process or Random Process