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離心率
Author:
RueiYi
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
算柱 (兩位數)
判斷球體
柱體建築師
Discover Resources
自行车运动
test02
Copy of 三角形的面積
學習活動二之二參數與圖形結構的關係
任意四边形各边中点的连线必构成平行四边形.许兴华数学
Discover Topics
Isosceles Triangles
Line Segment
Special Points
Statistical Characteristics
Algebra