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kevin20020905
GeoGebra
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sanjiaohanshu
三位數除以一位數（二）
三位數除以一位數（一）
拼砌四邊形
四邊形的特性
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畫三角形 題3a
陳人瑜proof81
Possible Outcomes of Rolling Two Dices 投擲兩枚骰子的可能結果
比一比看谁大
兩條直線垂直應用
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Median Line
Upper and Lower Sum or Riemann Sum
Parallelogram
Square
Translation