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Author:
iedc
GeoGebra
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兩位數除以一位數（二）
畫出對稱圖形
三位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等的四邊形
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Comparing fractions using number lines and rectangles
八芒星
傅立葉
图中的三角形面积何时最小？（许兴华数学）
定积分
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Translation
Trigonometric Functions
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Tree Diagrams