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利用对称求线段和最值（移动端）的副本
Author:
15823292902
,
梁航宇
GeoGebra
New Resources
圓的基本性質
龙形曲线-分形龙2
折扣
常见四边形是否是双心四边形
三角函数 的副本
Discover Resources
橢圓
異分母分數加法
正四角錐
GriffithsTheorem
橢圓2-四圓心近似法
Discover Topics
Coordinates
Parallelogram
Surface
Variance
Vectors 2D (Two-Dimensional)