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jaycheung2016plk
GeoGebra
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兩組對邊相等的四邊形
GeoGebra笔记功能体验课件
球體建築師
三位數除以一位數（二）
四邉形 (四年級) 教師版
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昨天各種筆的銷售情況
三角函數
圓周率的應用 題A
一般變換的副本
单位圆画三角函数图像的副本
Discover Topics
Square
Vectors 3D (Three-Dimensional)
Difference and Slope
Vectors
Root