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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
垂直線的斜率
直線的斜率：水平變化 & 鉛垂變化
常见四边形是否是双心四边形
平行線的斜率
直線的斜率
Discover Resources
How to derive the value of Pi
利用按扭制作控制動畫的開關
六下_圓周(學生版) v2.1
基础知识
集合间基本关系(wd)
Discover Topics
Hyperbola
Rhombus
Distributions
Sequences and Series
Step Functions