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利用对称求线段和最值（移动端）
Author:
梁航宇
GeoGebra
New Resources
Earth with coastline
Nested spiral octagon
第八周作业
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
Discover Resources
車輪車輪
正四面體
Quiz on Scientific Notation 科學記數法：測驗
相對位置的觀察
正方体镂空模型（通用）
Discover Topics
Expected Value
Vectors
Boxplot
Fractions
Right Triangles