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圖騰 DEMO
Author:
陳科旭
GeoGebra
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異分母分數減法
兩組對邊相等的四邊形
拼砌四邊形
兩位數除以一位數（二）
判斷球體
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I love you
點與圓的位置關係
Apollonius Problem 10 CCC wiki step 5
空間兩直線關係
Ex5C#10
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Angles
Variance
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