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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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直角坐標平面上的旋轉變換
兩位數除以一位數（二）
判斷球體
兩組對邊相等和有直角的四邊形
GeoGebra笔记功能体验课件
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Apollonius Problem 10 CCC wiki
sweet sugar
萬花筒
立體三角測量(例六)
用GGB制作奔驰轮胎.许兴华数学
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Optimization Problems
Fractions
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Addition
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