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Author:
Lin Ching Chieh
GeoGebra
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兩組對邊相等和有直角的四邊形
柱體建築師
兩位數除以一位數（一）
四邉形 (四年級) 教師版
【案例】圆柱体内放置一个大球六个小球
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會動的數據*3
旋轉動畫
Rolling Star
求一數佔全部的幾分之幾？
动点在折线或多边形上做匀速运动的实现方法-单位向量法
Discover Topics
Functions
Derivative
Difference and Slope
Similar Triangles
Arithmetic Mean