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对称拼图游戏
Author:
孟宝兴
GeoGebra
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画直线等分三角形的面积
畫出對稱圖形
兩位數除以一位數（二）
GeoGebra笔记功能体验课件
找出對稱軸
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試證明：A=B+C
證明三角形內角和180度
gjh-h04-01 多個堆疊的直角三角形
Dart Board
均值不等式的一种几何证明.许兴华数学
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Special Points
Straight Lines
Parallelogram
Optimization Problems
LCM and GCD