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动点与轨迹
Author:
林峰
GeoGebra
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祖冲之的期望：内棋与外棋
異分母分數減法
兩位數加法
漂亮的摇摆曲线
三位數除以一位數（二）
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y=(x-a)²的圖形
three
給錐體一個名字 4
Apollonius Problem 10 CCC wiki step 3
拖拉小正方体
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Natural Numbers
Hypothesis Testing
Conic Sections
Polygons
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