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例题2（P点可拖动）
Author:
杜洋
GeoGebra
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GeoGebra笔记功能体验课件
球體建築師
異分母分數減法
四邉形 (四年級) 教師版
三位數除以一位數（二）
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釘點紙畫三角形
test
等差數列的和
學資p.13第8題
垂線作圖
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Triangles
Exponential Functions
Optimization Problems
Difference and Slope
Perimeter