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四下:三角形内角和(折叠法)
Author:
钟秀群
GeoGebra
New Resources
第三周作业效果演示
双心四边形
盈利與虧蝕
三角函数 的副本
平行線的判定
Discover Resources
椭圆画法wj
旋轉體:Washer Method
If指令的應用1
規律物件
球表面积的一种特殊推导
Discover Topics
Straight Lines
Scalene Triangles
Geometric Distribution
Cylinder
Cuboid