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Author:
iedc
GeoGebra
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兩位數加法
算柱 (兩位數)
拼砌四邊形
畫出對稱圖形
第八周作业
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距離和
牟合方蓋
椭圆内光线的反射
保持比例
斜率是定值
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Means
Trapezoid
Similar Triangles
Combinatorics
Volume