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利用对称求线段和最值（移动端）
Author:
梁航宇
GeoGebra
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兩組對邊相等的四邊形
算柱 (兩位數)
GeoGebra笔记功能体验课件
找出對稱軸
球體建築師
Discover Resources
整數÷整數_工作紙（一）_題4
蝴蝶定理推廣證明1
Spiral Polyskelion
如何求切線長
运动的二面角.许兴华数学
Discover Topics
Circle
Frequency Distribution
Angles
Trigonometric Functions
Expected Value