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Author:
万超杰
GeoGebra
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四邉形 (四年級) 教師版
兩位數除以一位數（二）
判斷球體
算柱 (兩位數)
兩位數加法
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waaachen
彈跳球
五角星
基础知识
兩位數除三位數(商>10)
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Conic Sections
Quadrilaterals
Similar Triangles
Bar Chart or Bar Graph
Piecewise Functions