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Author:
葉冠和
GeoGebra
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兩組對邊相等和有直角的四邊形
拼砌四邊形
小数 的副本
畫出對稱圖形
三位數除以一位數（二）
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梯形中線
題八
判斷球體 3
扇形面積
三角函數圖形的平移
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Trigonometry
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Cuboid
Intersection
Multiplication